Expr.h revision f1b48b7014992155286d58bb1676f9f51031d18b
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "clang/AST/DeclAccessPair.h" 21#include "clang/AST/ASTVector.h" 22#include "clang/AST/UsuallyTinyPtrVector.h" 23#include "llvm/ADT/APSInt.h" 24#include "llvm/ADT/APFloat.h" 25#include "llvm/ADT/SmallVector.h" 26#include "llvm/ADT/StringRef.h" 27#include <vector> 28 29namespace clang { 30 class ASTContext; 31 class APValue; 32 class Decl; 33 class IdentifierInfo; 34 class ParmVarDecl; 35 class NamedDecl; 36 class ValueDecl; 37 class BlockDecl; 38 class CXXBaseSpecifier; 39 class CXXOperatorCallExpr; 40 class CXXMemberCallExpr; 41 class TemplateArgumentLoc; 42 class TemplateArgumentListInfo; 43 44/// \brief A simple array of base specifiers. 45typedef UsuallyTinyPtrVector<const CXXBaseSpecifier> CXXBaseSpecifierArray; 46 47/// Expr - This represents one expression. Note that Expr's are subclasses of 48/// Stmt. This allows an expression to be transparently used any place a Stmt 49/// is required. 50/// 51class Expr : public Stmt { 52 QualType TR; 53 54protected: 55 /// TypeDependent - Whether this expression is type-dependent 56 /// (C++ [temp.dep.expr]). 57 bool TypeDependent : 1; 58 59 /// ValueDependent - Whether this expression is value-dependent 60 /// (C++ [temp.dep.constexpr]). 61 bool ValueDependent : 1; 62 63 Expr(StmtClass SC, QualType T, bool TD, bool VD) 64 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 65 setType(T); 66 } 67 68 /// \brief Construct an empty expression. 69 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 70 71public: 72 /// \brief Increases the reference count for this expression. 73 /// 74 /// Invoke the Retain() operation when this expression 75 /// is being shared by another owner. 76 Expr *Retain() { 77 Stmt::Retain(); 78 return this; 79 } 80 81 QualType getType() const { return TR; } 82 void setType(QualType t) { 83 // In C++, the type of an expression is always adjusted so that it 84 // will not have reference type an expression will never have 85 // reference type (C++ [expr]p6). Use 86 // QualType::getNonReferenceType() to retrieve the non-reference 87 // type. Additionally, inspect Expr::isLvalue to determine whether 88 // an expression that is adjusted in this manner should be 89 // considered an lvalue. 90 assert((t.isNull() || !t->isReferenceType()) && 91 "Expressions can't have reference type"); 92 93 TR = t; 94 } 95 96 /// isValueDependent - Determines whether this expression is 97 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 98 /// array bound of "Chars" in the following example is 99 /// value-dependent. 100 /// @code 101 /// template<int Size, char (&Chars)[Size]> struct meta_string; 102 /// @endcode 103 bool isValueDependent() const { return ValueDependent; } 104 105 /// \brief Set whether this expression is value-dependent or not. 106 void setValueDependent(bool VD) { ValueDependent = VD; } 107 108 /// isTypeDependent - Determines whether this expression is 109 /// type-dependent (C++ [temp.dep.expr]), which means that its type 110 /// could change from one template instantiation to the next. For 111 /// example, the expressions "x" and "x + y" are type-dependent in 112 /// the following code, but "y" is not type-dependent: 113 /// @code 114 /// template<typename T> 115 /// void add(T x, int y) { 116 /// x + y; 117 /// } 118 /// @endcode 119 bool isTypeDependent() const { return TypeDependent; } 120 121 /// \brief Set whether this expression is type-dependent or not. 122 void setTypeDependent(bool TD) { TypeDependent = TD; } 123 124 /// SourceLocation tokens are not useful in isolation - they are low level 125 /// value objects created/interpreted by SourceManager. We assume AST 126 /// clients will have a pointer to the respective SourceManager. 127 virtual SourceRange getSourceRange() const = 0; 128 129 /// getExprLoc - Return the preferred location for the arrow when diagnosing 130 /// a problem with a generic expression. 131 virtual SourceLocation getExprLoc() const { return getLocStart(); } 132 133 /// isUnusedResultAWarning - Return true if this immediate expression should 134 /// be warned about if the result is unused. If so, fill in Loc and Ranges 135 /// with location to warn on and the source range[s] to report with the 136 /// warning. 137 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 138 SourceRange &R2, ASTContext &Ctx) const; 139 140 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 141 /// incomplete type other than void. Nonarray expressions that can be lvalues: 142 /// - name, where name must be a variable 143 /// - e[i] 144 /// - (e), where e must be an lvalue 145 /// - e.name, where e must be an lvalue 146 /// - e->name 147 /// - *e, the type of e cannot be a function type 148 /// - string-constant 149 /// - reference type [C++ [expr]] 150 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 151 /// 152 enum isLvalueResult { 153 LV_Valid, 154 LV_NotObjectType, 155 LV_IncompleteVoidType, 156 LV_DuplicateVectorComponents, 157 LV_InvalidExpression, 158 LV_MemberFunction, 159 LV_SubObjCPropertySetting, 160 LV_ClassTemporary 161 }; 162 isLvalueResult isLvalue(ASTContext &Ctx) const; 163 164 // Same as above, but excluding checks for non-object and void types in C 165 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 166 167 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 168 /// does not have an incomplete type, does not have a const-qualified type, 169 /// and if it is a structure or union, does not have any member (including, 170 /// recursively, any member or element of all contained aggregates or unions) 171 /// with a const-qualified type. 172 /// 173 /// \param Loc [in] [out] - A source location which *may* be filled 174 /// in with the location of the expression making this a 175 /// non-modifiable lvalue, if specified. 176 enum isModifiableLvalueResult { 177 MLV_Valid, 178 MLV_NotObjectType, 179 MLV_IncompleteVoidType, 180 MLV_DuplicateVectorComponents, 181 MLV_InvalidExpression, 182 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 183 MLV_IncompleteType, 184 MLV_ConstQualified, 185 MLV_ArrayType, 186 MLV_NotBlockQualified, 187 MLV_ReadonlyProperty, 188 MLV_NoSetterProperty, 189 MLV_MemberFunction, 190 MLV_SubObjCPropertySetting, 191 MLV_ClassTemporary 192 }; 193 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 194 SourceLocation *Loc = 0) const; 195 196 /// \brief If this expression refers to a bit-field, retrieve the 197 /// declaration of that bit-field. 198 FieldDecl *getBitField(); 199 200 const FieldDecl *getBitField() const { 201 return const_cast<Expr*>(this)->getBitField(); 202 } 203 204 /// \brief Returns whether this expression refers to a vector element. 205 bool refersToVectorElement() const; 206 207 /// isKnownToHaveBooleanValue - Return true if this is an integer expression 208 /// that is known to return 0 or 1. This happens for _Bool/bool expressions 209 /// but also int expressions which are produced by things like comparisons in 210 /// C. 211 bool isKnownToHaveBooleanValue() const; 212 213 /// isIntegerConstantExpr - Return true if this expression is a valid integer 214 /// constant expression, and, if so, return its value in Result. If not a 215 /// valid i-c-e, return false and fill in Loc (if specified) with the location 216 /// of the invalid expression. 217 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 218 SourceLocation *Loc = 0, 219 bool isEvaluated = true) const; 220 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 221 llvm::APSInt X; 222 return isIntegerConstantExpr(X, Ctx, Loc); 223 } 224 /// isConstantInitializer - Returns true if this expression is a constant 225 /// initializer, which can be emitted at compile-time. 226 bool isConstantInitializer(ASTContext &Ctx) const; 227 228 /// EvalResult is a struct with detailed info about an evaluated expression. 229 struct EvalResult { 230 /// Val - This is the value the expression can be folded to. 231 APValue Val; 232 233 /// HasSideEffects - Whether the evaluated expression has side effects. 234 /// For example, (f() && 0) can be folded, but it still has side effects. 235 bool HasSideEffects; 236 237 /// Diag - If the expression is unfoldable, then Diag contains a note 238 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 239 /// position for the error, and DiagExpr is the expression that caused 240 /// the error. 241 /// If the expression is foldable, but not an integer constant expression, 242 /// Diag contains a note diagnostic that describes why it isn't an integer 243 /// constant expression. If the expression *is* an integer constant 244 /// expression, then Diag will be zero. 245 unsigned Diag; 246 const Expr *DiagExpr; 247 SourceLocation DiagLoc; 248 249 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 250 }; 251 252 /// Evaluate - Return true if this is a constant which we can fold using 253 /// any crazy technique (that has nothing to do with language standards) that 254 /// we want to. If this function returns true, it returns the folded constant 255 /// in Result. 256 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 257 258 /// EvaluateAsAny - The same as Evaluate, except that it also succeeds on 259 /// stack based objects. 260 bool EvaluateAsAny(EvalResult &Result, ASTContext &Ctx) const; 261 262 /// EvaluateAsBooleanCondition - Return true if this is a constant 263 /// which we we can fold and convert to a boolean condition using 264 /// any crazy technique that we want to. 265 bool EvaluateAsBooleanCondition(bool &Result, ASTContext &Ctx) const; 266 267 /// isEvaluatable - Call Evaluate to see if this expression can be constant 268 /// folded, but discard the result. 269 bool isEvaluatable(ASTContext &Ctx) const; 270 271 /// HasSideEffects - This routine returns true for all those expressions 272 /// which must be evaluated each time and must not be optimization away 273 /// or evaluated at compile time. Example is a function call, volatile 274 /// variable read. 275 bool HasSideEffects(ASTContext &Ctx) const; 276 277 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 278 /// must be called on an expression that constant folds to an integer. 279 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 280 281 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 282 /// with link time known address. 283 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 284 285 /// EvaluateAsAnyLValue - The same as EvaluateAsLValue, except that it 286 /// also succeeds on stack based, immutable address lvalues. 287 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 288 289 /// \brief Enumeration used to describe how \c isNullPointerConstant() 290 /// should cope with value-dependent expressions. 291 enum NullPointerConstantValueDependence { 292 /// \brief Specifies that the expression should never be value-dependent. 293 NPC_NeverValueDependent = 0, 294 295 /// \brief Specifies that a value-dependent expression of integral or 296 /// dependent type should be considered a null pointer constant. 297 NPC_ValueDependentIsNull, 298 299 /// \brief Specifies that a value-dependent expression should be considered 300 /// to never be a null pointer constant. 301 NPC_ValueDependentIsNotNull 302 }; 303 304 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 305 /// integer constant expression with the value zero, or if this is one that is 306 /// cast to void*. 307 bool isNullPointerConstant(ASTContext &Ctx, 308 NullPointerConstantValueDependence NPC) const; 309 310 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 311 /// write barrier. 312 bool isOBJCGCCandidate(ASTContext &Ctx) const; 313 314 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 315 /// its subexpression. If that subexpression is also a ParenExpr, 316 /// then this method recursively returns its subexpression, and so forth. 317 /// Otherwise, the method returns the current Expr. 318 Expr *IgnoreParens(); 319 320 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 321 /// or CastExprs, returning their operand. 322 Expr *IgnoreParenCasts(); 323 324 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 325 /// value (including ptr->int casts of the same size). Strip off any 326 /// ParenExpr or CastExprs, returning their operand. 327 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 328 329 /// \brief Determine whether this expression is a default function argument. 330 /// 331 /// Default arguments are implicitly generated in the abstract syntax tree 332 /// by semantic analysis for function calls, object constructions, etc. in 333 /// C++. Default arguments are represented by \c CXXDefaultArgExpr nodes; 334 /// this routine also looks through any implicit casts to determine whether 335 /// the expression is a default argument. 336 bool isDefaultArgument() const; 337 338 /// \brief Determine whether this expression directly creates a 339 /// temporary object (of class type). 340 bool isTemporaryObject() const { return getTemporaryObject() != 0; } 341 342 /// \brief If this expression directly creates a temporary object of 343 /// class type, return the expression that actually constructs that 344 /// temporary object. 345 const Expr *getTemporaryObject() const; 346 347 const Expr *IgnoreParens() const { 348 return const_cast<Expr*>(this)->IgnoreParens(); 349 } 350 const Expr *IgnoreParenCasts() const { 351 return const_cast<Expr*>(this)->IgnoreParenCasts(); 352 } 353 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 354 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 355 } 356 357 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 358 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 359 360 static bool classof(const Stmt *T) { 361 return T->getStmtClass() >= firstExprConstant && 362 T->getStmtClass() <= lastExprConstant; 363 } 364 static bool classof(const Expr *) { return true; } 365}; 366 367 368//===----------------------------------------------------------------------===// 369// Primary Expressions. 370//===----------------------------------------------------------------------===// 371 372/// \brief Represents the qualifier that may precede a C++ name, e.g., the 373/// "std::" in "std::sort". 374struct NameQualifier { 375 /// \brief The nested name specifier. 376 NestedNameSpecifier *NNS; 377 378 /// \brief The source range covered by the nested name specifier. 379 SourceRange Range; 380}; 381 382/// \brief Represents an explicit template argument list in C++, e.g., 383/// the "<int>" in "sort<int>". 384struct ExplicitTemplateArgumentList { 385 /// \brief The source location of the left angle bracket ('<'); 386 SourceLocation LAngleLoc; 387 388 /// \brief The source location of the right angle bracket ('>'); 389 SourceLocation RAngleLoc; 390 391 /// \brief The number of template arguments in TemplateArgs. 392 /// The actual template arguments (if any) are stored after the 393 /// ExplicitTemplateArgumentList structure. 394 unsigned NumTemplateArgs; 395 396 /// \brief Retrieve the template arguments 397 TemplateArgumentLoc *getTemplateArgs() { 398 return reinterpret_cast<TemplateArgumentLoc *> (this + 1); 399 } 400 401 /// \brief Retrieve the template arguments 402 const TemplateArgumentLoc *getTemplateArgs() const { 403 return reinterpret_cast<const TemplateArgumentLoc *> (this + 1); 404 } 405 406 void initializeFrom(const TemplateArgumentListInfo &List); 407 void copyInto(TemplateArgumentListInfo &List) const; 408 static std::size_t sizeFor(const TemplateArgumentListInfo &List); 409}; 410 411/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 412/// enum, etc. 413class DeclRefExpr : public Expr { 414 enum { 415 // Flag on DecoratedD that specifies when this declaration reference 416 // expression has a C++ nested-name-specifier. 417 HasQualifierFlag = 0x01, 418 // Flag on DecoratedD that specifies when this declaration reference 419 // expression has an explicit C++ template argument list. 420 HasExplicitTemplateArgumentListFlag = 0x02 421 }; 422 423 // DecoratedD - The declaration that we are referencing, plus two bits to 424 // indicate whether (1) the declaration's name was explicitly qualified and 425 // (2) the declaration's name was followed by an explicit template 426 // argument list. 427 llvm::PointerIntPair<ValueDecl *, 2> DecoratedD; 428 429 // Loc - The location of the declaration name itself. 430 SourceLocation Loc; 431 432 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 433 NameQualifier *getNameQualifier() { 434 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 435 return 0; 436 437 return reinterpret_cast<NameQualifier *> (this + 1); 438 } 439 440 /// \brief Retrieve the qualifier that preceded the member name, if any. 441 const NameQualifier *getNameQualifier() const { 442 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 443 } 444 445 /// \brief Retrieve the explicit template argument list that followed the 446 /// member template name, if any. 447 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 448 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 449 return 0; 450 451 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 452 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 453 454 return reinterpret_cast<ExplicitTemplateArgumentList *>( 455 getNameQualifier() + 1); 456 } 457 458 /// \brief Retrieve the explicit template argument list that followed the 459 /// member template name, if any. 460 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 461 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 462 } 463 464 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 465 ValueDecl *D, SourceLocation NameLoc, 466 const TemplateArgumentListInfo *TemplateArgs, 467 QualType T); 468 469protected: 470 /// \brief Computes the type- and value-dependence flags for this 471 /// declaration reference expression. 472 void computeDependence(); 473 474 DeclRefExpr(StmtClass SC, ValueDecl *d, QualType t, SourceLocation l) : 475 Expr(SC, t, false, false), DecoratedD(d, 0), Loc(l) { 476 computeDependence(); 477 } 478 479public: 480 DeclRefExpr(ValueDecl *d, QualType t, SourceLocation l) : 481 Expr(DeclRefExprClass, t, false, false), DecoratedD(d, 0), Loc(l) { 482 computeDependence(); 483 } 484 485 /// \brief Construct an empty declaration reference expression. 486 explicit DeclRefExpr(EmptyShell Empty) 487 : Expr(DeclRefExprClass, Empty) { } 488 489 static DeclRefExpr *Create(ASTContext &Context, 490 NestedNameSpecifier *Qualifier, 491 SourceRange QualifierRange, 492 ValueDecl *D, 493 SourceLocation NameLoc, 494 QualType T, 495 const TemplateArgumentListInfo *TemplateArgs = 0); 496 497 ValueDecl *getDecl() { return DecoratedD.getPointer(); } 498 const ValueDecl *getDecl() const { return DecoratedD.getPointer(); } 499 void setDecl(ValueDecl *NewD) { DecoratedD.setPointer(NewD); } 500 501 SourceLocation getLocation() const { return Loc; } 502 void setLocation(SourceLocation L) { Loc = L; } 503 virtual SourceRange getSourceRange() const; 504 505 /// \brief Determine whether this declaration reference was preceded by a 506 /// C++ nested-name-specifier, e.g., \c N::foo. 507 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 508 509 /// \brief If the name was qualified, retrieves the source range of 510 /// the nested-name-specifier that precedes the name. Otherwise, 511 /// returns an empty source range. 512 SourceRange getQualifierRange() const { 513 if (!hasQualifier()) 514 return SourceRange(); 515 516 return getNameQualifier()->Range; 517 } 518 519 /// \brief If the name was qualified, retrieves the nested-name-specifier 520 /// that precedes the name. Otherwise, returns NULL. 521 NestedNameSpecifier *getQualifier() const { 522 if (!hasQualifier()) 523 return 0; 524 525 return getNameQualifier()->NNS; 526 } 527 528 /// \brief Determines whether this member expression actually had a C++ 529 /// template argument list explicitly specified, e.g., x.f<int>. 530 bool hasExplicitTemplateArgumentList() const { 531 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 532 } 533 534 /// \brief Copies the template arguments (if present) into the given 535 /// structure. 536 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 537 if (hasExplicitTemplateArgumentList()) 538 getExplicitTemplateArgumentList()->copyInto(List); 539 } 540 541 /// \brief Retrieve the location of the left angle bracket following the 542 /// member name ('<'), if any. 543 SourceLocation getLAngleLoc() const { 544 if (!hasExplicitTemplateArgumentList()) 545 return SourceLocation(); 546 547 return getExplicitTemplateArgumentList()->LAngleLoc; 548 } 549 550 /// \brief Retrieve the template arguments provided as part of this 551 /// template-id. 552 const TemplateArgumentLoc *getTemplateArgs() const { 553 if (!hasExplicitTemplateArgumentList()) 554 return 0; 555 556 return getExplicitTemplateArgumentList()->getTemplateArgs(); 557 } 558 559 /// \brief Retrieve the number of template arguments provided as part of this 560 /// template-id. 561 unsigned getNumTemplateArgs() const { 562 if (!hasExplicitTemplateArgumentList()) 563 return 0; 564 565 return getExplicitTemplateArgumentList()->NumTemplateArgs; 566 } 567 568 /// \brief Retrieve the location of the right angle bracket following the 569 /// template arguments ('>'). 570 SourceLocation getRAngleLoc() const { 571 if (!hasExplicitTemplateArgumentList()) 572 return SourceLocation(); 573 574 return getExplicitTemplateArgumentList()->RAngleLoc; 575 } 576 577 static bool classof(const Stmt *T) { 578 return T->getStmtClass() == DeclRefExprClass; 579 } 580 static bool classof(const DeclRefExpr *) { return true; } 581 582 // Iterators 583 virtual child_iterator child_begin(); 584 virtual child_iterator child_end(); 585}; 586 587/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 588class PredefinedExpr : public Expr { 589public: 590 enum IdentType { 591 Func, 592 Function, 593 PrettyFunction, 594 /// PrettyFunctionNoVirtual - The same as PrettyFunction, except that the 595 /// 'virtual' keyword is omitted for virtual member functions. 596 PrettyFunctionNoVirtual 597 }; 598 599private: 600 SourceLocation Loc; 601 IdentType Type; 602public: 603 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 604 : Expr(PredefinedExprClass, type, type->isDependentType(), 605 type->isDependentType()), Loc(l), Type(IT) {} 606 607 /// \brief Construct an empty predefined expression. 608 explicit PredefinedExpr(EmptyShell Empty) 609 : Expr(PredefinedExprClass, Empty) { } 610 611 IdentType getIdentType() const { return Type; } 612 void setIdentType(IdentType IT) { Type = IT; } 613 614 SourceLocation getLocation() const { return Loc; } 615 void setLocation(SourceLocation L) { Loc = L; } 616 617 static std::string ComputeName(IdentType IT, const Decl *CurrentDecl); 618 619 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 620 621 static bool classof(const Stmt *T) { 622 return T->getStmtClass() == PredefinedExprClass; 623 } 624 static bool classof(const PredefinedExpr *) { return true; } 625 626 // Iterators 627 virtual child_iterator child_begin(); 628 virtual child_iterator child_end(); 629}; 630 631class IntegerLiteral : public Expr { 632 llvm::APInt Value; 633 SourceLocation Loc; 634public: 635 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 636 // or UnsignedLongLongTy 637 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 638 : Expr(IntegerLiteralClass, type, false, false), Value(V), Loc(l) { 639 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 640 } 641 642 /// \brief Construct an empty integer literal. 643 explicit IntegerLiteral(EmptyShell Empty) 644 : Expr(IntegerLiteralClass, Empty) { } 645 646 const llvm::APInt &getValue() const { return Value; } 647 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 648 649 /// \brief Retrieve the location of the literal. 650 SourceLocation getLocation() const { return Loc; } 651 652 void setValue(const llvm::APInt &Val) { Value = Val; } 653 void setLocation(SourceLocation Location) { Loc = Location; } 654 655 static bool classof(const Stmt *T) { 656 return T->getStmtClass() == IntegerLiteralClass; 657 } 658 static bool classof(const IntegerLiteral *) { return true; } 659 660 // Iterators 661 virtual child_iterator child_begin(); 662 virtual child_iterator child_end(); 663}; 664 665class CharacterLiteral : public Expr { 666 unsigned Value; 667 SourceLocation Loc; 668 bool IsWide; 669public: 670 // type should be IntTy 671 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 672 : Expr(CharacterLiteralClass, type, false, false), Value(value), Loc(l), 673 IsWide(iswide) { 674 } 675 676 /// \brief Construct an empty character literal. 677 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 678 679 SourceLocation getLocation() const { return Loc; } 680 bool isWide() const { return IsWide; } 681 682 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 683 684 unsigned getValue() const { return Value; } 685 686 void setLocation(SourceLocation Location) { Loc = Location; } 687 void setWide(bool W) { IsWide = W; } 688 void setValue(unsigned Val) { Value = Val; } 689 690 static bool classof(const Stmt *T) { 691 return T->getStmtClass() == CharacterLiteralClass; 692 } 693 static bool classof(const CharacterLiteral *) { return true; } 694 695 // Iterators 696 virtual child_iterator child_begin(); 697 virtual child_iterator child_end(); 698}; 699 700class FloatingLiteral : public Expr { 701 llvm::APFloat Value; 702 bool IsExact : 1; 703 SourceLocation Loc; 704public: 705 FloatingLiteral(const llvm::APFloat &V, bool isexact, 706 QualType Type, SourceLocation L) 707 : Expr(FloatingLiteralClass, Type, false, false), Value(V), 708 IsExact(isexact), Loc(L) {} 709 710 /// \brief Construct an empty floating-point literal. 711 explicit FloatingLiteral(EmptyShell Empty) 712 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 713 714 const llvm::APFloat &getValue() const { return Value; } 715 void setValue(const llvm::APFloat &Val) { Value = Val; } 716 717 bool isExact() const { return IsExact; } 718 void setExact(bool E) { IsExact = E; } 719 720 /// getValueAsApproximateDouble - This returns the value as an inaccurate 721 /// double. Note that this may cause loss of precision, but is useful for 722 /// debugging dumps, etc. 723 double getValueAsApproximateDouble() const; 724 725 SourceLocation getLocation() const { return Loc; } 726 void setLocation(SourceLocation L) { Loc = L; } 727 728 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 729 730 static bool classof(const Stmt *T) { 731 return T->getStmtClass() == FloatingLiteralClass; 732 } 733 static bool classof(const FloatingLiteral *) { return true; } 734 735 // Iterators 736 virtual child_iterator child_begin(); 737 virtual child_iterator child_end(); 738}; 739 740/// ImaginaryLiteral - We support imaginary integer and floating point literals, 741/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 742/// IntegerLiteral classes. Instances of this class always have a Complex type 743/// whose element type matches the subexpression. 744/// 745class ImaginaryLiteral : public Expr { 746 Stmt *Val; 747public: 748 ImaginaryLiteral(Expr *val, QualType Ty) 749 : Expr(ImaginaryLiteralClass, Ty, false, false), Val(val) {} 750 751 /// \brief Build an empty imaginary literal. 752 explicit ImaginaryLiteral(EmptyShell Empty) 753 : Expr(ImaginaryLiteralClass, Empty) { } 754 755 const Expr *getSubExpr() const { return cast<Expr>(Val); } 756 Expr *getSubExpr() { return cast<Expr>(Val); } 757 void setSubExpr(Expr *E) { Val = E; } 758 759 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 760 static bool classof(const Stmt *T) { 761 return T->getStmtClass() == ImaginaryLiteralClass; 762 } 763 static bool classof(const ImaginaryLiteral *) { return true; } 764 765 // Iterators 766 virtual child_iterator child_begin(); 767 virtual child_iterator child_end(); 768}; 769 770/// StringLiteral - This represents a string literal expression, e.g. "foo" 771/// or L"bar" (wide strings). The actual string is returned by getStrData() 772/// is NOT null-terminated, and the length of the string is determined by 773/// calling getByteLength(). The C type for a string is always a 774/// ConstantArrayType. In C++, the char type is const qualified, in C it is 775/// not. 776/// 777/// Note that strings in C can be formed by concatenation of multiple string 778/// literal pptokens in translation phase #6. This keeps track of the locations 779/// of each of these pieces. 780/// 781/// Strings in C can also be truncated and extended by assigning into arrays, 782/// e.g. with constructs like: 783/// char X[2] = "foobar"; 784/// In this case, getByteLength() will return 6, but the string literal will 785/// have type "char[2]". 786class StringLiteral : public Expr { 787 const char *StrData; 788 unsigned ByteLength; 789 bool IsWide; 790 unsigned NumConcatenated; 791 SourceLocation TokLocs[1]; 792 793 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty, false, false) {} 794 795protected: 796 virtual void DoDestroy(ASTContext &C); 797 798public: 799 /// This is the "fully general" constructor that allows representation of 800 /// strings formed from multiple concatenated tokens. 801 static StringLiteral *Create(ASTContext &C, const char *StrData, 802 unsigned ByteLength, bool Wide, QualType Ty, 803 const SourceLocation *Loc, unsigned NumStrs); 804 805 /// Simple constructor for string literals made from one token. 806 static StringLiteral *Create(ASTContext &C, const char *StrData, 807 unsigned ByteLength, 808 bool Wide, QualType Ty, SourceLocation Loc) { 809 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 810 } 811 812 /// \brief Construct an empty string literal. 813 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 814 815 llvm::StringRef getString() const { 816 return llvm::StringRef(StrData, ByteLength); 817 } 818 // FIXME: These are deprecated, replace with StringRef. 819 const char *getStrData() const { return StrData; } 820 unsigned getByteLength() const { return ByteLength; } 821 822 /// \brief Sets the string data to the given string data. 823 void setString(ASTContext &C, llvm::StringRef Str); 824 825 bool isWide() const { return IsWide; } 826 void setWide(bool W) { IsWide = W; } 827 828 bool containsNonAsciiOrNull() const { 829 llvm::StringRef Str = getString(); 830 for (unsigned i = 0, e = Str.size(); i != e; ++i) 831 if (!isascii(Str[i]) || !Str[i]) 832 return true; 833 return false; 834 } 835 /// getNumConcatenated - Get the number of string literal tokens that were 836 /// concatenated in translation phase #6 to form this string literal. 837 unsigned getNumConcatenated() const { return NumConcatenated; } 838 839 SourceLocation getStrTokenLoc(unsigned TokNum) const { 840 assert(TokNum < NumConcatenated && "Invalid tok number"); 841 return TokLocs[TokNum]; 842 } 843 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 844 assert(TokNum < NumConcatenated && "Invalid tok number"); 845 TokLocs[TokNum] = L; 846 } 847 848 typedef const SourceLocation *tokloc_iterator; 849 tokloc_iterator tokloc_begin() const { return TokLocs; } 850 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 851 852 virtual SourceRange getSourceRange() const { 853 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 854 } 855 static bool classof(const Stmt *T) { 856 return T->getStmtClass() == StringLiteralClass; 857 } 858 static bool classof(const StringLiteral *) { return true; } 859 860 // Iterators 861 virtual child_iterator child_begin(); 862 virtual child_iterator child_end(); 863}; 864 865/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 866/// AST node is only formed if full location information is requested. 867class ParenExpr : public Expr { 868 SourceLocation L, R; 869 Stmt *Val; 870public: 871 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 872 : Expr(ParenExprClass, val->getType(), 873 val->isTypeDependent(), val->isValueDependent()), 874 L(l), R(r), Val(val) {} 875 876 /// \brief Construct an empty parenthesized expression. 877 explicit ParenExpr(EmptyShell Empty) 878 : Expr(ParenExprClass, Empty) { } 879 880 const Expr *getSubExpr() const { return cast<Expr>(Val); } 881 Expr *getSubExpr() { return cast<Expr>(Val); } 882 void setSubExpr(Expr *E) { Val = E; } 883 884 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 885 886 /// \brief Get the location of the left parentheses '('. 887 SourceLocation getLParen() const { return L; } 888 void setLParen(SourceLocation Loc) { L = Loc; } 889 890 /// \brief Get the location of the right parentheses ')'. 891 SourceLocation getRParen() const { return R; } 892 void setRParen(SourceLocation Loc) { R = Loc; } 893 894 static bool classof(const Stmt *T) { 895 return T->getStmtClass() == ParenExprClass; 896 } 897 static bool classof(const ParenExpr *) { return true; } 898 899 // Iterators 900 virtual child_iterator child_begin(); 901 virtual child_iterator child_end(); 902}; 903 904 905/// UnaryOperator - This represents the unary-expression's (except sizeof and 906/// alignof), the postinc/postdec operators from postfix-expression, and various 907/// extensions. 908/// 909/// Notes on various nodes: 910/// 911/// Real/Imag - These return the real/imag part of a complex operand. If 912/// applied to a non-complex value, the former returns its operand and the 913/// later returns zero in the type of the operand. 914/// 915/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 916/// subexpression is a compound literal with the various MemberExpr and 917/// ArraySubscriptExpr's applied to it. 918/// 919class UnaryOperator : public Expr { 920public: 921 // Note that additions to this should also update the StmtVisitor class. 922 enum Opcode { 923 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 924 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 925 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 926 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 927 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 928 Real, Imag, // "__real expr"/"__imag expr" Extension. 929 Extension, // __extension__ marker. 930 OffsetOf // __builtin_offsetof 931 }; 932private: 933 Stmt *Val; 934 Opcode Opc; 935 SourceLocation Loc; 936public: 937 938 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 939 : Expr(UnaryOperatorClass, type, 940 input->isTypeDependent() && opc != OffsetOf, 941 input->isValueDependent()), 942 Val(input), Opc(opc), Loc(l) {} 943 944 /// \brief Build an empty unary operator. 945 explicit UnaryOperator(EmptyShell Empty) 946 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 947 948 Opcode getOpcode() const { return Opc; } 949 void setOpcode(Opcode O) { Opc = O; } 950 951 Expr *getSubExpr() const { return cast<Expr>(Val); } 952 void setSubExpr(Expr *E) { Val = E; } 953 954 /// getOperatorLoc - Return the location of the operator. 955 SourceLocation getOperatorLoc() const { return Loc; } 956 void setOperatorLoc(SourceLocation L) { Loc = L; } 957 958 /// isPostfix - Return true if this is a postfix operation, like x++. 959 static bool isPostfix(Opcode Op) { 960 return Op == PostInc || Op == PostDec; 961 } 962 963 /// isPostfix - Return true if this is a prefix operation, like --x. 964 static bool isPrefix(Opcode Op) { 965 return Op == PreInc || Op == PreDec; 966 } 967 968 bool isPrefix() const { return isPrefix(Opc); } 969 bool isPostfix() const { return isPostfix(Opc); } 970 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 971 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 972 bool isOffsetOfOp() const { return Opc == OffsetOf; } 973 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 974 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 975 976 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 977 /// corresponds to, e.g. "sizeof" or "[pre]++" 978 static const char *getOpcodeStr(Opcode Op); 979 980 /// \brief Retrieve the unary opcode that corresponds to the given 981 /// overloaded operator. 982 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 983 984 /// \brief Retrieve the overloaded operator kind that corresponds to 985 /// the given unary opcode. 986 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 987 988 virtual SourceRange getSourceRange() const { 989 if (isPostfix()) 990 return SourceRange(Val->getLocStart(), Loc); 991 else 992 return SourceRange(Loc, Val->getLocEnd()); 993 } 994 virtual SourceLocation getExprLoc() const { return Loc; } 995 996 static bool classof(const Stmt *T) { 997 return T->getStmtClass() == UnaryOperatorClass; 998 } 999 static bool classof(const UnaryOperator *) { return true; } 1000 1001 // Iterators 1002 virtual child_iterator child_begin(); 1003 virtual child_iterator child_end(); 1004}; 1005 1006/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 1007/// types and expressions. 1008class SizeOfAlignOfExpr : public Expr { 1009 bool isSizeof : 1; // true if sizeof, false if alignof. 1010 bool isType : 1; // true if operand is a type, false if an expression 1011 union { 1012 TypeSourceInfo *Ty; 1013 Stmt *Ex; 1014 } Argument; 1015 SourceLocation OpLoc, RParenLoc; 1016 1017protected: 1018 virtual void DoDestroy(ASTContext& C); 1019 1020public: 1021 SizeOfAlignOfExpr(bool issizeof, TypeSourceInfo *TInfo, 1022 QualType resultType, SourceLocation op, 1023 SourceLocation rp) : 1024 Expr(SizeOfAlignOfExprClass, resultType, 1025 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1026 // Value-dependent if the argument is type-dependent. 1027 TInfo->getType()->isDependentType()), 1028 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 1029 Argument.Ty = TInfo; 1030 } 1031 1032 SizeOfAlignOfExpr(bool issizeof, Expr *E, 1033 QualType resultType, SourceLocation op, 1034 SourceLocation rp) : 1035 Expr(SizeOfAlignOfExprClass, resultType, 1036 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1037 // Value-dependent if the argument is type-dependent. 1038 E->isTypeDependent()), 1039 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1040 Argument.Ex = E; 1041 } 1042 1043 /// \brief Construct an empty sizeof/alignof expression. 1044 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1045 : Expr(SizeOfAlignOfExprClass, Empty) { } 1046 1047 bool isSizeOf() const { return isSizeof; } 1048 void setSizeof(bool S) { isSizeof = S; } 1049 1050 bool isArgumentType() const { return isType; } 1051 QualType getArgumentType() const { 1052 return getArgumentTypeInfo()->getType(); 1053 } 1054 TypeSourceInfo *getArgumentTypeInfo() const { 1055 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1056 return Argument.Ty; 1057 } 1058 Expr *getArgumentExpr() { 1059 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1060 return static_cast<Expr*>(Argument.Ex); 1061 } 1062 const Expr *getArgumentExpr() const { 1063 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1064 } 1065 1066 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1067 void setArgument(TypeSourceInfo *TInfo) { 1068 Argument.Ty = TInfo; 1069 isType = true; 1070 } 1071 1072 /// Gets the argument type, or the type of the argument expression, whichever 1073 /// is appropriate. 1074 QualType getTypeOfArgument() const { 1075 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1076 } 1077 1078 SourceLocation getOperatorLoc() const { return OpLoc; } 1079 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1080 1081 SourceLocation getRParenLoc() const { return RParenLoc; } 1082 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1083 1084 virtual SourceRange getSourceRange() const { 1085 return SourceRange(OpLoc, RParenLoc); 1086 } 1087 1088 static bool classof(const Stmt *T) { 1089 return T->getStmtClass() == SizeOfAlignOfExprClass; 1090 } 1091 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1092 1093 // Iterators 1094 virtual child_iterator child_begin(); 1095 virtual child_iterator child_end(); 1096}; 1097 1098//===----------------------------------------------------------------------===// 1099// Postfix Operators. 1100//===----------------------------------------------------------------------===// 1101 1102/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1103class ArraySubscriptExpr : public Expr { 1104 enum { LHS, RHS, END_EXPR=2 }; 1105 Stmt* SubExprs[END_EXPR]; 1106 SourceLocation RBracketLoc; 1107public: 1108 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1109 SourceLocation rbracketloc) 1110 : Expr(ArraySubscriptExprClass, t, 1111 lhs->isTypeDependent() || rhs->isTypeDependent(), 1112 lhs->isValueDependent() || rhs->isValueDependent()), 1113 RBracketLoc(rbracketloc) { 1114 SubExprs[LHS] = lhs; 1115 SubExprs[RHS] = rhs; 1116 } 1117 1118 /// \brief Create an empty array subscript expression. 1119 explicit ArraySubscriptExpr(EmptyShell Shell) 1120 : Expr(ArraySubscriptExprClass, Shell) { } 1121 1122 /// An array access can be written A[4] or 4[A] (both are equivalent). 1123 /// - getBase() and getIdx() always present the normalized view: A[4]. 1124 /// In this case getBase() returns "A" and getIdx() returns "4". 1125 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1126 /// 4[A] getLHS() returns "4". 1127 /// Note: Because vector element access is also written A[4] we must 1128 /// predicate the format conversion in getBase and getIdx only on the 1129 /// the type of the RHS, as it is possible for the LHS to be a vector of 1130 /// integer type 1131 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1132 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1133 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1134 1135 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1136 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1137 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1138 1139 Expr *getBase() { 1140 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1141 } 1142 1143 const Expr *getBase() const { 1144 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1145 } 1146 1147 Expr *getIdx() { 1148 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1149 } 1150 1151 const Expr *getIdx() const { 1152 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1153 } 1154 1155 virtual SourceRange getSourceRange() const { 1156 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1157 } 1158 1159 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1160 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1161 1162 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1163 1164 static bool classof(const Stmt *T) { 1165 return T->getStmtClass() == ArraySubscriptExprClass; 1166 } 1167 static bool classof(const ArraySubscriptExpr *) { return true; } 1168 1169 // Iterators 1170 virtual child_iterator child_begin(); 1171 virtual child_iterator child_end(); 1172}; 1173 1174 1175/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1176/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1177/// while its subclasses may represent alternative syntax that (semantically) 1178/// results in a function call. For example, CXXOperatorCallExpr is 1179/// a subclass for overloaded operator calls that use operator syntax, e.g., 1180/// "str1 + str2" to resolve to a function call. 1181class CallExpr : public Expr { 1182 enum { FN=0, ARGS_START=1 }; 1183 Stmt **SubExprs; 1184 unsigned NumArgs; 1185 SourceLocation RParenLoc; 1186 1187protected: 1188 // This version of the constructor is for derived classes. 1189 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1190 QualType t, SourceLocation rparenloc); 1191 1192 virtual void DoDestroy(ASTContext& C); 1193 1194public: 1195 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1196 SourceLocation rparenloc); 1197 1198 /// \brief Build an empty call expression. 1199 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1200 1201 ~CallExpr() {} 1202 1203 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1204 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1205 void setCallee(Expr *F) { SubExprs[FN] = F; } 1206 1207 Decl *getCalleeDecl(); 1208 const Decl *getCalleeDecl() const { 1209 return const_cast<CallExpr*>(this)->getCalleeDecl(); 1210 } 1211 1212 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1213 FunctionDecl *getDirectCallee(); 1214 const FunctionDecl *getDirectCallee() const { 1215 return const_cast<CallExpr*>(this)->getDirectCallee(); 1216 } 1217 1218 /// getNumArgs - Return the number of actual arguments to this call. 1219 /// 1220 unsigned getNumArgs() const { return NumArgs; } 1221 1222 /// getArg - Return the specified argument. 1223 Expr *getArg(unsigned Arg) { 1224 assert(Arg < NumArgs && "Arg access out of range!"); 1225 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1226 } 1227 const Expr *getArg(unsigned Arg) const { 1228 assert(Arg < NumArgs && "Arg access out of range!"); 1229 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1230 } 1231 1232 /// setArg - Set the specified argument. 1233 void setArg(unsigned Arg, Expr *ArgExpr) { 1234 assert(Arg < NumArgs && "Arg access out of range!"); 1235 SubExprs[Arg+ARGS_START] = ArgExpr; 1236 } 1237 1238 /// setNumArgs - This changes the number of arguments present in this call. 1239 /// Any orphaned expressions are deleted by this, and any new operands are set 1240 /// to null. 1241 void setNumArgs(ASTContext& C, unsigned NumArgs); 1242 1243 typedef ExprIterator arg_iterator; 1244 typedef ConstExprIterator const_arg_iterator; 1245 1246 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1247 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1248 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1249 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1250 1251 /// getNumCommas - Return the number of commas that must have been present in 1252 /// this function call. 1253 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1254 1255 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1256 /// not, return 0. 1257 unsigned isBuiltinCall(ASTContext &Context) const; 1258 1259 /// getCallReturnType - Get the return type of the call expr. This is not 1260 /// always the type of the expr itself, if the return type is a reference 1261 /// type. 1262 QualType getCallReturnType() const; 1263 1264 SourceLocation getRParenLoc() const { return RParenLoc; } 1265 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1266 1267 virtual SourceRange getSourceRange() const { 1268 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1269 } 1270 1271 static bool classof(const Stmt *T) { 1272 return T->getStmtClass() == CallExprClass || 1273 T->getStmtClass() == CXXOperatorCallExprClass || 1274 T->getStmtClass() == CXXMemberCallExprClass; 1275 } 1276 static bool classof(const CallExpr *) { return true; } 1277 static bool classof(const CXXOperatorCallExpr *) { return true; } 1278 static bool classof(const CXXMemberCallExpr *) { return true; } 1279 1280 // Iterators 1281 virtual child_iterator child_begin(); 1282 virtual child_iterator child_end(); 1283}; 1284 1285/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1286/// 1287class MemberExpr : public Expr { 1288 /// Extra data stored in some member expressions. 1289 struct MemberNameQualifier : public NameQualifier { 1290 DeclAccessPair FoundDecl; 1291 }; 1292 1293 /// Base - the expression for the base pointer or structure references. In 1294 /// X.F, this is "X". 1295 Stmt *Base; 1296 1297 /// MemberDecl - This is the decl being referenced by the field/member name. 1298 /// In X.F, this is the decl referenced by F. 1299 ValueDecl *MemberDecl; 1300 1301 /// MemberLoc - This is the location of the member name. 1302 SourceLocation MemberLoc; 1303 1304 /// IsArrow - True if this is "X->F", false if this is "X.F". 1305 bool IsArrow : 1; 1306 1307 /// \brief True if this member expression used a nested-name-specifier to 1308 /// refer to the member, e.g., "x->Base::f", or found its member via a using 1309 /// declaration. When true, a MemberNameQualifier 1310 /// structure is allocated immediately after the MemberExpr. 1311 bool HasQualifierOrFoundDecl : 1; 1312 1313 /// \brief True if this member expression specified a template argument list 1314 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1315 /// structure (and its TemplateArguments) are allocated immediately after 1316 /// the MemberExpr or, if the member expression also has a qualifier, after 1317 /// the MemberNameQualifier structure. 1318 bool HasExplicitTemplateArgumentList : 1; 1319 1320 /// \brief Retrieve the qualifier that preceded the member name, if any. 1321 MemberNameQualifier *getMemberQualifier() { 1322 assert(HasQualifierOrFoundDecl); 1323 return reinterpret_cast<MemberNameQualifier *> (this + 1); 1324 } 1325 1326 /// \brief Retrieve the qualifier that preceded the member name, if any. 1327 const MemberNameQualifier *getMemberQualifier() const { 1328 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1329 } 1330 1331 /// \brief Retrieve the explicit template argument list that followed the 1332 /// member template name, if any. 1333 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1334 if (!HasExplicitTemplateArgumentList) 1335 return 0; 1336 1337 if (!HasQualifierOrFoundDecl) 1338 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1339 1340 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1341 getMemberQualifier() + 1); 1342 } 1343 1344 /// \brief Retrieve the explicit template argument list that followed the 1345 /// member template name, if any. 1346 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1347 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1348 } 1349 1350public: 1351 MemberExpr(Expr *base, bool isarrow, ValueDecl *memberdecl, 1352 SourceLocation l, QualType ty) 1353 : Expr(MemberExprClass, ty, 1354 base->isTypeDependent(), base->isValueDependent()), 1355 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1356 HasQualifierOrFoundDecl(false), HasExplicitTemplateArgumentList(false) {} 1357 1358 /// \brief Build an empty member reference expression. 1359 explicit MemberExpr(EmptyShell Empty) 1360 : Expr(MemberExprClass, Empty), HasQualifierOrFoundDecl(false), 1361 HasExplicitTemplateArgumentList(false) { } 1362 1363 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1364 NestedNameSpecifier *qual, SourceRange qualrange, 1365 ValueDecl *memberdecl, DeclAccessPair founddecl, 1366 SourceLocation l, 1367 const TemplateArgumentListInfo *targs, 1368 QualType ty); 1369 1370 void setBase(Expr *E) { Base = E; } 1371 Expr *getBase() const { return cast<Expr>(Base); } 1372 1373 /// \brief Retrieve the member declaration to which this expression refers. 1374 /// 1375 /// The returned declaration will either be a FieldDecl or (in C++) 1376 /// a CXXMethodDecl. 1377 ValueDecl *getMemberDecl() const { return MemberDecl; } 1378 void setMemberDecl(ValueDecl *D) { MemberDecl = D; } 1379 1380 /// \brief Retrieves the declaration found by lookup. 1381 DeclAccessPair getFoundDecl() const { 1382 if (!HasQualifierOrFoundDecl) 1383 return DeclAccessPair::make(getMemberDecl(), 1384 getMemberDecl()->getAccess()); 1385 return getMemberQualifier()->FoundDecl; 1386 } 1387 1388 /// \brief Determines whether this member expression actually had 1389 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1390 /// x->Base::foo. 1391 bool hasQualifier() const { return getQualifier() != 0; } 1392 1393 /// \brief If the member name was qualified, retrieves the source range of 1394 /// the nested-name-specifier that precedes the member name. Otherwise, 1395 /// returns an empty source range. 1396 SourceRange getQualifierRange() const { 1397 if (!HasQualifierOrFoundDecl) 1398 return SourceRange(); 1399 1400 return getMemberQualifier()->Range; 1401 } 1402 1403 /// \brief If the member name was qualified, retrieves the 1404 /// nested-name-specifier that precedes the member name. Otherwise, returns 1405 /// NULL. 1406 NestedNameSpecifier *getQualifier() const { 1407 if (!HasQualifierOrFoundDecl) 1408 return 0; 1409 1410 return getMemberQualifier()->NNS; 1411 } 1412 1413 /// \brief Determines whether this member expression actually had a C++ 1414 /// template argument list explicitly specified, e.g., x.f<int>. 1415 bool hasExplicitTemplateArgumentList() const { 1416 return HasExplicitTemplateArgumentList; 1417 } 1418 1419 /// \brief Copies the template arguments (if present) into the given 1420 /// structure. 1421 void copyTemplateArgumentsInto(TemplateArgumentListInfo &List) const { 1422 if (hasExplicitTemplateArgumentList()) 1423 getExplicitTemplateArgumentList()->copyInto(List); 1424 } 1425 1426 /// \brief Retrieve the location of the left angle bracket following the 1427 /// member name ('<'), if any. 1428 SourceLocation getLAngleLoc() const { 1429 if (!HasExplicitTemplateArgumentList) 1430 return SourceLocation(); 1431 1432 return getExplicitTemplateArgumentList()->LAngleLoc; 1433 } 1434 1435 /// \brief Retrieve the template arguments provided as part of this 1436 /// template-id. 1437 const TemplateArgumentLoc *getTemplateArgs() const { 1438 if (!HasExplicitTemplateArgumentList) 1439 return 0; 1440 1441 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1442 } 1443 1444 /// \brief Retrieve the number of template arguments provided as part of this 1445 /// template-id. 1446 unsigned getNumTemplateArgs() const { 1447 if (!HasExplicitTemplateArgumentList) 1448 return 0; 1449 1450 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1451 } 1452 1453 /// \brief Retrieve the location of the right angle bracket following the 1454 /// template arguments ('>'). 1455 SourceLocation getRAngleLoc() const { 1456 if (!HasExplicitTemplateArgumentList) 1457 return SourceLocation(); 1458 1459 return getExplicitTemplateArgumentList()->RAngleLoc; 1460 } 1461 1462 bool isArrow() const { return IsArrow; } 1463 void setArrow(bool A) { IsArrow = A; } 1464 1465 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1466 /// location of 'F'. 1467 SourceLocation getMemberLoc() const { return MemberLoc; } 1468 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1469 1470 virtual SourceRange getSourceRange() const { 1471 // If we have an implicit base (like a C++ implicit this), 1472 // make sure not to return its location 1473 SourceLocation EndLoc = MemberLoc; 1474 if (HasExplicitTemplateArgumentList) 1475 EndLoc = getRAngleLoc(); 1476 1477 SourceLocation BaseLoc = getBase()->getLocStart(); 1478 if (BaseLoc.isInvalid()) 1479 return SourceRange(MemberLoc, EndLoc); 1480 return SourceRange(BaseLoc, EndLoc); 1481 } 1482 1483 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1484 1485 static bool classof(const Stmt *T) { 1486 return T->getStmtClass() == MemberExprClass; 1487 } 1488 static bool classof(const MemberExpr *) { return true; } 1489 1490 // Iterators 1491 virtual child_iterator child_begin(); 1492 virtual child_iterator child_end(); 1493}; 1494 1495/// CompoundLiteralExpr - [C99 6.5.2.5] 1496/// 1497class CompoundLiteralExpr : public Expr { 1498 /// LParenLoc - If non-null, this is the location of the left paren in a 1499 /// compound literal like "(int){4}". This can be null if this is a 1500 /// synthesized compound expression. 1501 SourceLocation LParenLoc; 1502 1503 /// The type as written. This can be an incomplete array type, in 1504 /// which case the actual expression type will be different. 1505 TypeSourceInfo *TInfo; 1506 Stmt *Init; 1507 bool FileScope; 1508public: 1509 // FIXME: Can compound literals be value-dependent? 1510 CompoundLiteralExpr(SourceLocation lparenloc, TypeSourceInfo *tinfo, 1511 QualType T, Expr *init, bool fileScope) 1512 : Expr(CompoundLiteralExprClass, T, 1513 tinfo->getType()->isDependentType(), false), 1514 LParenLoc(lparenloc), TInfo(tinfo), Init(init), FileScope(fileScope) {} 1515 1516 /// \brief Construct an empty compound literal. 1517 explicit CompoundLiteralExpr(EmptyShell Empty) 1518 : Expr(CompoundLiteralExprClass, Empty) { } 1519 1520 const Expr *getInitializer() const { return cast<Expr>(Init); } 1521 Expr *getInitializer() { return cast<Expr>(Init); } 1522 void setInitializer(Expr *E) { Init = E; } 1523 1524 bool isFileScope() const { return FileScope; } 1525 void setFileScope(bool FS) { FileScope = FS; } 1526 1527 SourceLocation getLParenLoc() const { return LParenLoc; } 1528 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1529 1530 TypeSourceInfo *getTypeSourceInfo() const { return TInfo; } 1531 void setTypeSourceInfo(TypeSourceInfo* tinfo) { TInfo = tinfo; } 1532 1533 virtual SourceRange getSourceRange() const { 1534 // FIXME: Init should never be null. 1535 if (!Init) 1536 return SourceRange(); 1537 if (LParenLoc.isInvalid()) 1538 return Init->getSourceRange(); 1539 return SourceRange(LParenLoc, Init->getLocEnd()); 1540 } 1541 1542 static bool classof(const Stmt *T) { 1543 return T->getStmtClass() == CompoundLiteralExprClass; 1544 } 1545 static bool classof(const CompoundLiteralExpr *) { return true; } 1546 1547 // Iterators 1548 virtual child_iterator child_begin(); 1549 virtual child_iterator child_end(); 1550}; 1551 1552/// CastExpr - Base class for type casts, including both implicit 1553/// casts (ImplicitCastExpr) and explicit casts that have some 1554/// representation in the source code (ExplicitCastExpr's derived 1555/// classes). 1556class CastExpr : public Expr { 1557public: 1558 /// CastKind - the kind of cast this represents. 1559 enum CastKind { 1560 /// CK_Unknown - Unknown cast kind. 1561 /// FIXME: The goal is to get rid of this and make all casts have a 1562 /// kind so that the AST client doesn't have to try to figure out what's 1563 /// going on. 1564 CK_Unknown, 1565 1566 /// CK_BitCast - Used for reinterpret_cast. 1567 CK_BitCast, 1568 1569 /// CK_NoOp - Used for const_cast. 1570 CK_NoOp, 1571 1572 /// CK_BaseToDerived - Base to derived class casts. 1573 CK_BaseToDerived, 1574 1575 /// CK_DerivedToBase - Derived to base class casts. 1576 CK_DerivedToBase, 1577 1578 /// CK_UncheckedDerivedToBase - Derived to base class casts that 1579 /// assume that the derived pointer is not null. 1580 CK_UncheckedDerivedToBase, 1581 1582 /// CK_Dynamic - Dynamic cast. 1583 CK_Dynamic, 1584 1585 /// CK_ToUnion - Cast to union (GCC extension). 1586 CK_ToUnion, 1587 1588 /// CK_ArrayToPointerDecay - Array to pointer decay. 1589 CK_ArrayToPointerDecay, 1590 1591 // CK_FunctionToPointerDecay - Function to pointer decay. 1592 CK_FunctionToPointerDecay, 1593 1594 /// CK_NullToMemberPointer - Null pointer to member pointer. 1595 CK_NullToMemberPointer, 1596 1597 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1598 /// member pointer in derived class. 1599 CK_BaseToDerivedMemberPointer, 1600 1601 /// CK_DerivedToBaseMemberPointer - Member pointer in derived class to 1602 /// member pointer in base class. 1603 CK_DerivedToBaseMemberPointer, 1604 1605 /// CK_UserDefinedConversion - Conversion using a user defined type 1606 /// conversion function. 1607 CK_UserDefinedConversion, 1608 1609 /// CK_ConstructorConversion - Conversion by constructor 1610 CK_ConstructorConversion, 1611 1612 /// CK_IntegralToPointer - Integral to pointer 1613 CK_IntegralToPointer, 1614 1615 /// CK_PointerToIntegral - Pointer to integral 1616 CK_PointerToIntegral, 1617 1618 /// CK_ToVoid - Cast to void. 1619 CK_ToVoid, 1620 1621 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1622 /// vector type with the same element type as the src type. Splats the 1623 /// src expression into the destination expression. 1624 CK_VectorSplat, 1625 1626 /// CK_IntegralCast - Casting between integral types of different size. 1627 CK_IntegralCast, 1628 1629 /// CK_IntegralToFloating - Integral to floating point. 1630 CK_IntegralToFloating, 1631 1632 /// CK_FloatingToIntegral - Floating point to integral. 1633 CK_FloatingToIntegral, 1634 1635 /// CK_FloatingCast - Casting between floating types of different size. 1636 CK_FloatingCast, 1637 1638 /// CK_MemberPointerToBoolean - Member pointer to boolean 1639 CK_MemberPointerToBoolean, 1640 1641 /// CK_AnyPointerToObjCPointerCast - Casting any pointer to objective-c 1642 /// pointer 1643 CK_AnyPointerToObjCPointerCast, 1644 /// CK_AnyPointerToBlockPointerCast - Casting any pointer to block 1645 /// pointer 1646 CK_AnyPointerToBlockPointerCast 1647 1648 }; 1649 1650private: 1651 CastKind Kind; 1652 Stmt *Op; 1653 1654 /// BasePath - For derived-to-base and base-to-derived casts, the base array 1655 /// contains the inheritance path. 1656 CXXBaseSpecifierArray BasePath; 1657 1658 void CheckBasePath() const { 1659#ifndef NDEBUG 1660 switch (getCastKind()) { 1661 // FIXME: We should add inheritance paths for these. 1662 case CK_BaseToDerived: 1663 case CK_DerivedToBase: 1664 case CK_UncheckedDerivedToBase: 1665 case CK_BaseToDerivedMemberPointer: 1666 case CK_DerivedToBaseMemberPointer: 1667 1668 // These should not have an inheritance path. 1669 case CK_Unknown: 1670 case CK_BitCast: 1671 case CK_NoOp: 1672 case CK_Dynamic: 1673 case CK_ToUnion: 1674 case CK_ArrayToPointerDecay: 1675 case CK_FunctionToPointerDecay: 1676 case CK_NullToMemberPointer: 1677 case CK_UserDefinedConversion: 1678 case CK_ConstructorConversion: 1679 case CK_IntegralToPointer: 1680 case CK_PointerToIntegral: 1681 case CK_ToVoid: 1682 case CK_VectorSplat: 1683 case CK_IntegralCast: 1684 case CK_IntegralToFloating: 1685 case CK_FloatingToIntegral: 1686 case CK_FloatingCast: 1687 case CK_MemberPointerToBoolean: 1688 case CK_AnyPointerToObjCPointerCast: 1689 case CK_AnyPointerToBlockPointerCast: 1690 assert(BasePath.empty() && "Cast kind shoudl not have a base path!"); 1691 break; 1692 } 1693#endif 1694 } 1695 1696protected: 1697 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op, 1698 CXXBaseSpecifierArray BasePath) : 1699 Expr(SC, ty, 1700 // Cast expressions are type-dependent if the type is 1701 // dependent (C++ [temp.dep.expr]p3). 1702 ty->isDependentType(), 1703 // Cast expressions are value-dependent if the type is 1704 // dependent or if the subexpression is value-dependent. 1705 ty->isDependentType() || (op && op->isValueDependent())), 1706 Kind(kind), Op(op), BasePath(BasePath) { 1707 CheckBasePath(); 1708 } 1709 1710 /// \brief Construct an empty cast. 1711 CastExpr(StmtClass SC, EmptyShell Empty) 1712 : Expr(SC, Empty) { } 1713 1714 virtual void DoDestroy(ASTContext &C); 1715 1716public: 1717 CastKind getCastKind() const { return Kind; } 1718 void setCastKind(CastKind K) { Kind = K; } 1719 const char *getCastKindName() const; 1720 1721 Expr *getSubExpr() { return cast<Expr>(Op); } 1722 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1723 void setSubExpr(Expr *E) { Op = E; } 1724 1725 /// \brief Retrieve the cast subexpression as it was written in the source 1726 /// code, looking through any implicit casts or other intermediate nodes 1727 /// introduced by semantic analysis. 1728 Expr *getSubExprAsWritten(); 1729 const Expr *getSubExprAsWritten() const { 1730 return const_cast<CastExpr *>(this)->getSubExprAsWritten(); 1731 } 1732 1733 static bool classof(const Stmt *T) { 1734 StmtClass SC = T->getStmtClass(); 1735 if (SC >= CXXStaticCastExprClass && SC <= CXXFunctionalCastExprClass) 1736 return true; 1737 1738 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1739 return true; 1740 1741 return false; 1742 } 1743 static bool classof(const CastExpr *) { return true; } 1744 1745 // Iterators 1746 virtual child_iterator child_begin(); 1747 virtual child_iterator child_end(); 1748}; 1749 1750/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1751/// conversions, which have no direct representation in the original 1752/// source code. For example: converting T[]->T*, void f()->void 1753/// (*f)(), float->double, short->int, etc. 1754/// 1755/// In C, implicit casts always produce rvalues. However, in C++, an 1756/// implicit cast whose result is being bound to a reference will be 1757/// an lvalue. For example: 1758/// 1759/// @code 1760/// class Base { }; 1761/// class Derived : public Base { }; 1762/// void f(Derived d) { 1763/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1764/// } 1765/// @endcode 1766class ImplicitCastExpr : public CastExpr { 1767 /// LvalueCast - Whether this cast produces an lvalue. 1768 bool LvalueCast; 1769 1770public: 1771 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, 1772 CXXBaseSpecifierArray BasePath, bool Lvalue) 1773 : CastExpr(ImplicitCastExprClass, ty, kind, op, BasePath), 1774 LvalueCast(Lvalue) { } 1775 1776 /// \brief Construct an empty implicit cast. 1777 explicit ImplicitCastExpr(EmptyShell Shell) 1778 : CastExpr(ImplicitCastExprClass, Shell) { } 1779 1780 virtual SourceRange getSourceRange() const { 1781 return getSubExpr()->getSourceRange(); 1782 } 1783 1784 /// isLvalueCast - Whether this cast produces an lvalue. 1785 bool isLvalueCast() const { return LvalueCast; } 1786 1787 /// setLvalueCast - Set whether this cast produces an lvalue. 1788 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1789 1790 static bool classof(const Stmt *T) { 1791 return T->getStmtClass() == ImplicitCastExprClass; 1792 } 1793 static bool classof(const ImplicitCastExpr *) { return true; } 1794}; 1795 1796/// ExplicitCastExpr - An explicit cast written in the source 1797/// code. 1798/// 1799/// This class is effectively an abstract class, because it provides 1800/// the basic representation of an explicitly-written cast without 1801/// specifying which kind of cast (C cast, functional cast, static 1802/// cast, etc.) was written; specific derived classes represent the 1803/// particular style of cast and its location information. 1804/// 1805/// Unlike implicit casts, explicit cast nodes have two different 1806/// types: the type that was written into the source code, and the 1807/// actual type of the expression as determined by semantic 1808/// analysis. These types may differ slightly. For example, in C++ one 1809/// can cast to a reference type, which indicates that the resulting 1810/// expression will be an lvalue. The reference type, however, will 1811/// not be used as the type of the expression. 1812class ExplicitCastExpr : public CastExpr { 1813 /// TInfo - Source type info for the (written) type 1814 /// this expression is casting to. 1815 TypeSourceInfo *TInfo; 1816 1817protected: 1818 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 1819 Expr *op, TypeSourceInfo *writtenTy) 1820 : CastExpr(SC, exprTy, kind, op, CXXBaseSpecifierArray()), 1821 TInfo(writtenTy) {} 1822 1823 /// \brief Construct an empty explicit cast. 1824 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1825 : CastExpr(SC, Shell) { } 1826 1827public: 1828 /// getTypeInfoAsWritten - Returns the type source info for the type 1829 /// that this expression is casting to. 1830 TypeSourceInfo *getTypeInfoAsWritten() const { return TInfo; } 1831 void setTypeInfoAsWritten(TypeSourceInfo *writtenTy) { TInfo = writtenTy; } 1832 1833 /// getTypeAsWritten - Returns the type that this expression is 1834 /// casting to, as written in the source code. 1835 QualType getTypeAsWritten() const { return TInfo->getType(); } 1836 1837 static bool classof(const Stmt *T) { 1838 StmtClass SC = T->getStmtClass(); 1839 if (SC >= CStyleCastExprClass && SC <= CStyleCastExprClass) 1840 return true; 1841 if (SC >= CXXStaticCastExprClass && SC <= CXXFunctionalCastExprClass) 1842 return true; 1843 1844 return false; 1845 } 1846 static bool classof(const ExplicitCastExpr *) { return true; } 1847}; 1848 1849/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1850/// cast in C++ (C++ [expr.cast]), which uses the syntax 1851/// (Type)expr. For example: @c (int)f. 1852class CStyleCastExpr : public ExplicitCastExpr { 1853 SourceLocation LPLoc; // the location of the left paren 1854 SourceLocation RPLoc; // the location of the right paren 1855public: 1856 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, 1857 TypeSourceInfo *writtenTy, 1858 SourceLocation l, SourceLocation r) : 1859 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1860 LPLoc(l), RPLoc(r) {} 1861 1862 /// \brief Construct an empty C-style explicit cast. 1863 explicit CStyleCastExpr(EmptyShell Shell) 1864 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1865 1866 SourceLocation getLParenLoc() const { return LPLoc; } 1867 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1868 1869 SourceLocation getRParenLoc() const { return RPLoc; } 1870 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1871 1872 virtual SourceRange getSourceRange() const { 1873 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1874 } 1875 static bool classof(const Stmt *T) { 1876 return T->getStmtClass() == CStyleCastExprClass; 1877 } 1878 static bool classof(const CStyleCastExpr *) { return true; } 1879}; 1880 1881/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1882/// 1883/// This expression node kind describes a builtin binary operation, 1884/// such as "x + y" for integer values "x" and "y". The operands will 1885/// already have been converted to appropriate types (e.g., by 1886/// performing promotions or conversions). 1887/// 1888/// In C++, where operators may be overloaded, a different kind of 1889/// expression node (CXXOperatorCallExpr) is used to express the 1890/// invocation of an overloaded operator with operator syntax. Within 1891/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1892/// used to store an expression "x + y" depends on the subexpressions 1893/// for x and y. If neither x or y is type-dependent, and the "+" 1894/// operator resolves to a built-in operation, BinaryOperator will be 1895/// used to express the computation (x and y may still be 1896/// value-dependent). If either x or y is type-dependent, or if the 1897/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1898/// be used to express the computation. 1899class BinaryOperator : public Expr { 1900public: 1901 enum Opcode { 1902 // Operators listed in order of precedence. 1903 // Note that additions to this should also update the StmtVisitor class. 1904 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1905 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1906 Add, Sub, // [C99 6.5.6] Additive operators. 1907 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1908 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1909 EQ, NE, // [C99 6.5.9] Equality operators. 1910 And, // [C99 6.5.10] Bitwise AND operator. 1911 Xor, // [C99 6.5.11] Bitwise XOR operator. 1912 Or, // [C99 6.5.12] Bitwise OR operator. 1913 LAnd, // [C99 6.5.13] Logical AND operator. 1914 LOr, // [C99 6.5.14] Logical OR operator. 1915 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1916 DivAssign, RemAssign, 1917 AddAssign, SubAssign, 1918 ShlAssign, ShrAssign, 1919 AndAssign, XorAssign, 1920 OrAssign, 1921 Comma // [C99 6.5.17] Comma operator. 1922 }; 1923private: 1924 enum { LHS, RHS, END_EXPR }; 1925 Stmt* SubExprs[END_EXPR]; 1926 Opcode Opc; 1927 SourceLocation OpLoc; 1928public: 1929 1930 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1931 SourceLocation opLoc) 1932 : Expr(BinaryOperatorClass, ResTy, 1933 lhs->isTypeDependent() || rhs->isTypeDependent(), 1934 lhs->isValueDependent() || rhs->isValueDependent()), 1935 Opc(opc), OpLoc(opLoc) { 1936 SubExprs[LHS] = lhs; 1937 SubExprs[RHS] = rhs; 1938 assert(!isCompoundAssignmentOp() && 1939 "Use ArithAssignBinaryOperator for compound assignments"); 1940 } 1941 1942 /// \brief Construct an empty binary operator. 1943 explicit BinaryOperator(EmptyShell Empty) 1944 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1945 1946 SourceLocation getOperatorLoc() const { return OpLoc; } 1947 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1948 1949 Opcode getOpcode() const { return Opc; } 1950 void setOpcode(Opcode O) { Opc = O; } 1951 1952 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1953 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1954 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1955 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1956 1957 virtual SourceRange getSourceRange() const { 1958 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1959 } 1960 1961 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1962 /// corresponds to, e.g. "<<=". 1963 static const char *getOpcodeStr(Opcode Op); 1964 1965 /// \brief Retrieve the binary opcode that corresponds to the given 1966 /// overloaded operator. 1967 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1968 1969 /// \brief Retrieve the overloaded operator kind that corresponds to 1970 /// the given binary opcode. 1971 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1972 1973 /// predicates to categorize the respective opcodes. 1974 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1975 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1976 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 1977 bool isShiftOp() const { return isShiftOp(Opc); } 1978 1979 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 1980 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 1981 1982 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1983 bool isRelationalOp() const { return isRelationalOp(Opc); } 1984 1985 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1986 bool isEqualityOp() const { return isEqualityOp(Opc); } 1987 1988 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 1989 bool isComparisonOp() const { return isComparisonOp(Opc); } 1990 1991 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1992 bool isLogicalOp() const { return isLogicalOp(Opc); } 1993 1994 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1995 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1996 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1997 1998 static bool classof(const Stmt *S) { 1999 return S->getStmtClass() == BinaryOperatorClass || 2000 S->getStmtClass() == CompoundAssignOperatorClass; 2001 } 2002 static bool classof(const BinaryOperator *) { return true; } 2003 2004 // Iterators 2005 virtual child_iterator child_begin(); 2006 virtual child_iterator child_end(); 2007 2008protected: 2009 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 2010 SourceLocation opLoc, bool dead) 2011 : Expr(CompoundAssignOperatorClass, ResTy, 2012 lhs->isTypeDependent() || rhs->isTypeDependent(), 2013 lhs->isValueDependent() || rhs->isValueDependent()), 2014 Opc(opc), OpLoc(opLoc) { 2015 SubExprs[LHS] = lhs; 2016 SubExprs[RHS] = rhs; 2017 } 2018 2019 BinaryOperator(StmtClass SC, EmptyShell Empty) 2020 : Expr(SC, Empty), Opc(MulAssign) { } 2021}; 2022 2023/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 2024/// track of the type the operation is performed in. Due to the semantics of 2025/// these operators, the operands are promoted, the aritmetic performed, an 2026/// implicit conversion back to the result type done, then the assignment takes 2027/// place. This captures the intermediate type which the computation is done 2028/// in. 2029class CompoundAssignOperator : public BinaryOperator { 2030 QualType ComputationLHSType; 2031 QualType ComputationResultType; 2032public: 2033 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 2034 QualType ResType, QualType CompLHSType, 2035 QualType CompResultType, 2036 SourceLocation OpLoc) 2037 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 2038 ComputationLHSType(CompLHSType), 2039 ComputationResultType(CompResultType) { 2040 assert(isCompoundAssignmentOp() && 2041 "Only should be used for compound assignments"); 2042 } 2043 2044 /// \brief Build an empty compound assignment operator expression. 2045 explicit CompoundAssignOperator(EmptyShell Empty) 2046 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 2047 2048 // The two computation types are the type the LHS is converted 2049 // to for the computation and the type of the result; the two are 2050 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 2051 QualType getComputationLHSType() const { return ComputationLHSType; } 2052 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 2053 2054 QualType getComputationResultType() const { return ComputationResultType; } 2055 void setComputationResultType(QualType T) { ComputationResultType = T; } 2056 2057 static bool classof(const CompoundAssignOperator *) { return true; } 2058 static bool classof(const Stmt *S) { 2059 return S->getStmtClass() == CompoundAssignOperatorClass; 2060 } 2061}; 2062 2063/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 2064/// GNU "missing LHS" extension is in use. 2065/// 2066class ConditionalOperator : public Expr { 2067 enum { COND, LHS, RHS, END_EXPR }; 2068 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2069 SourceLocation QuestionLoc, ColonLoc; 2070public: 2071 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 2072 SourceLocation CLoc, Expr *rhs, QualType t) 2073 : Expr(ConditionalOperatorClass, t, 2074 // FIXME: the type of the conditional operator doesn't 2075 // depend on the type of the conditional, but the standard 2076 // seems to imply that it could. File a bug! 2077 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 2078 (cond->isValueDependent() || 2079 (lhs && lhs->isValueDependent()) || 2080 (rhs && rhs->isValueDependent()))), 2081 QuestionLoc(QLoc), 2082 ColonLoc(CLoc) { 2083 SubExprs[COND] = cond; 2084 SubExprs[LHS] = lhs; 2085 SubExprs[RHS] = rhs; 2086 } 2087 2088 /// \brief Build an empty conditional operator. 2089 explicit ConditionalOperator(EmptyShell Empty) 2090 : Expr(ConditionalOperatorClass, Empty) { } 2091 2092 // getCond - Return the expression representing the condition for 2093 // the ?: operator. 2094 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2095 void setCond(Expr *E) { SubExprs[COND] = E; } 2096 2097 // getTrueExpr - Return the subexpression representing the value of the ?: 2098 // expression if the condition evaluates to true. In most cases this value 2099 // will be the same as getLHS() except a GCC extension allows the left 2100 // subexpression to be omitted, and instead of the condition be returned. 2101 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 2102 // is only evaluated once. 2103 Expr *getTrueExpr() const { 2104 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 2105 } 2106 2107 // getTrueExpr - Return the subexpression representing the value of the ?: 2108 // expression if the condition evaluates to false. This is the same as getRHS. 2109 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 2110 2111 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 2112 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2113 2114 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2115 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2116 2117 SourceLocation getQuestionLoc() const { return QuestionLoc; } 2118 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 2119 2120 SourceLocation getColonLoc() const { return ColonLoc; } 2121 void setColonLoc(SourceLocation L) { ColonLoc = L; } 2122 2123 virtual SourceRange getSourceRange() const { 2124 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 2125 } 2126 static bool classof(const Stmt *T) { 2127 return T->getStmtClass() == ConditionalOperatorClass; 2128 } 2129 static bool classof(const ConditionalOperator *) { return true; } 2130 2131 // Iterators 2132 virtual child_iterator child_begin(); 2133 virtual child_iterator child_end(); 2134}; 2135 2136/// AddrLabelExpr - The GNU address of label extension, representing &&label. 2137class AddrLabelExpr : public Expr { 2138 SourceLocation AmpAmpLoc, LabelLoc; 2139 LabelStmt *Label; 2140public: 2141 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 2142 QualType t) 2143 : Expr(AddrLabelExprClass, t, false, false), 2144 AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 2145 2146 /// \brief Build an empty address of a label expression. 2147 explicit AddrLabelExpr(EmptyShell Empty) 2148 : Expr(AddrLabelExprClass, Empty) { } 2149 2150 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2151 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2152 SourceLocation getLabelLoc() const { return LabelLoc; } 2153 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2154 2155 virtual SourceRange getSourceRange() const { 2156 return SourceRange(AmpAmpLoc, LabelLoc); 2157 } 2158 2159 LabelStmt *getLabel() const { return Label; } 2160 void setLabel(LabelStmt *S) { Label = S; } 2161 2162 static bool classof(const Stmt *T) { 2163 return T->getStmtClass() == AddrLabelExprClass; 2164 } 2165 static bool classof(const AddrLabelExpr *) { return true; } 2166 2167 // Iterators 2168 virtual child_iterator child_begin(); 2169 virtual child_iterator child_end(); 2170}; 2171 2172/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2173/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2174/// takes the value of the last subexpression. 2175class StmtExpr : public Expr { 2176 Stmt *SubStmt; 2177 SourceLocation LParenLoc, RParenLoc; 2178public: 2179 // FIXME: Does type-dependence need to be computed differently? 2180 StmtExpr(CompoundStmt *substmt, QualType T, 2181 SourceLocation lp, SourceLocation rp) : 2182 Expr(StmtExprClass, T, T->isDependentType(), false), 2183 SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2184 2185 /// \brief Build an empty statement expression. 2186 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2187 2188 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2189 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2190 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2191 2192 virtual SourceRange getSourceRange() const { 2193 return SourceRange(LParenLoc, RParenLoc); 2194 } 2195 2196 SourceLocation getLParenLoc() const { return LParenLoc; } 2197 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2198 SourceLocation getRParenLoc() const { return RParenLoc; } 2199 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2200 2201 static bool classof(const Stmt *T) { 2202 return T->getStmtClass() == StmtExprClass; 2203 } 2204 static bool classof(const StmtExpr *) { return true; } 2205 2206 // Iterators 2207 virtual child_iterator child_begin(); 2208 virtual child_iterator child_end(); 2209}; 2210 2211/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2212/// This AST node represents a function that returns 1 if two *types* (not 2213/// expressions) are compatible. The result of this built-in function can be 2214/// used in integer constant expressions. 2215class TypesCompatibleExpr : public Expr { 2216 QualType Type1; 2217 QualType Type2; 2218 SourceLocation BuiltinLoc, RParenLoc; 2219public: 2220 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2221 QualType t1, QualType t2, SourceLocation RP) : 2222 Expr(TypesCompatibleExprClass, ReturnType, false, false), 2223 Type1(t1), Type2(t2), BuiltinLoc(BLoc), RParenLoc(RP) {} 2224 2225 /// \brief Build an empty __builtin_type_compatible_p expression. 2226 explicit TypesCompatibleExpr(EmptyShell Empty) 2227 : Expr(TypesCompatibleExprClass, Empty) { } 2228 2229 QualType getArgType1() const { return Type1; } 2230 void setArgType1(QualType T) { Type1 = T; } 2231 QualType getArgType2() const { return Type2; } 2232 void setArgType2(QualType T) { Type2 = T; } 2233 2234 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2235 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2236 2237 SourceLocation getRParenLoc() const { return RParenLoc; } 2238 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2239 2240 virtual SourceRange getSourceRange() const { 2241 return SourceRange(BuiltinLoc, RParenLoc); 2242 } 2243 static bool classof(const Stmt *T) { 2244 return T->getStmtClass() == TypesCompatibleExprClass; 2245 } 2246 static bool classof(const TypesCompatibleExpr *) { return true; } 2247 2248 // Iterators 2249 virtual child_iterator child_begin(); 2250 virtual child_iterator child_end(); 2251}; 2252 2253/// ShuffleVectorExpr - clang-specific builtin-in function 2254/// __builtin_shufflevector. 2255/// This AST node represents a operator that does a constant 2256/// shuffle, similar to LLVM's shufflevector instruction. It takes 2257/// two vectors and a variable number of constant indices, 2258/// and returns the appropriately shuffled vector. 2259class ShuffleVectorExpr : public Expr { 2260 SourceLocation BuiltinLoc, RParenLoc; 2261 2262 // SubExprs - the list of values passed to the __builtin_shufflevector 2263 // function. The first two are vectors, and the rest are constant 2264 // indices. The number of values in this list is always 2265 // 2+the number of indices in the vector type. 2266 Stmt **SubExprs; 2267 unsigned NumExprs; 2268 2269protected: 2270 virtual void DoDestroy(ASTContext &C); 2271 2272public: 2273 // FIXME: Can a shufflevector be value-dependent? Does type-dependence need 2274 // to be computed differently? 2275 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2276 QualType Type, SourceLocation BLoc, 2277 SourceLocation RP) : 2278 Expr(ShuffleVectorExprClass, Type, Type->isDependentType(), false), 2279 BuiltinLoc(BLoc), RParenLoc(RP), NumExprs(nexpr) { 2280 2281 SubExprs = new (C) Stmt*[nexpr]; 2282 for (unsigned i = 0; i < nexpr; i++) 2283 SubExprs[i] = args[i]; 2284 } 2285 2286 /// \brief Build an empty vector-shuffle expression. 2287 explicit ShuffleVectorExpr(EmptyShell Empty) 2288 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2289 2290 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2291 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2292 2293 SourceLocation getRParenLoc() const { return RParenLoc; } 2294 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2295 2296 virtual SourceRange getSourceRange() const { 2297 return SourceRange(BuiltinLoc, RParenLoc); 2298 } 2299 static bool classof(const Stmt *T) { 2300 return T->getStmtClass() == ShuffleVectorExprClass; 2301 } 2302 static bool classof(const ShuffleVectorExpr *) { return true; } 2303 2304 ~ShuffleVectorExpr() {} 2305 2306 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2307 /// constant expression, the actual arguments passed in, and the function 2308 /// pointers. 2309 unsigned getNumSubExprs() const { return NumExprs; } 2310 2311 /// getExpr - Return the Expr at the specified index. 2312 Expr *getExpr(unsigned Index) { 2313 assert((Index < NumExprs) && "Arg access out of range!"); 2314 return cast<Expr>(SubExprs[Index]); 2315 } 2316 const Expr *getExpr(unsigned Index) const { 2317 assert((Index < NumExprs) && "Arg access out of range!"); 2318 return cast<Expr>(SubExprs[Index]); 2319 } 2320 2321 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2322 2323 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2324 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2325 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2326 } 2327 2328 // Iterators 2329 virtual child_iterator child_begin(); 2330 virtual child_iterator child_end(); 2331}; 2332 2333/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2334/// This AST node is similar to the conditional operator (?:) in C, with 2335/// the following exceptions: 2336/// - the test expression must be a integer constant expression. 2337/// - the expression returned acts like the chosen subexpression in every 2338/// visible way: the type is the same as that of the chosen subexpression, 2339/// and all predicates (whether it's an l-value, whether it's an integer 2340/// constant expression, etc.) return the same result as for the chosen 2341/// sub-expression. 2342class ChooseExpr : public Expr { 2343 enum { COND, LHS, RHS, END_EXPR }; 2344 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2345 SourceLocation BuiltinLoc, RParenLoc; 2346public: 2347 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2348 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2349 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2350 BuiltinLoc(BLoc), RParenLoc(RP) { 2351 SubExprs[COND] = cond; 2352 SubExprs[LHS] = lhs; 2353 SubExprs[RHS] = rhs; 2354 } 2355 2356 /// \brief Build an empty __builtin_choose_expr. 2357 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2358 2359 /// isConditionTrue - Return whether the condition is true (i.e. not 2360 /// equal to zero). 2361 bool isConditionTrue(ASTContext &C) const; 2362 2363 /// getChosenSubExpr - Return the subexpression chosen according to the 2364 /// condition. 2365 Expr *getChosenSubExpr(ASTContext &C) const { 2366 return isConditionTrue(C) ? getLHS() : getRHS(); 2367 } 2368 2369 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2370 void setCond(Expr *E) { SubExprs[COND] = E; } 2371 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2372 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2373 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2374 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2375 2376 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2377 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2378 2379 SourceLocation getRParenLoc() const { return RParenLoc; } 2380 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2381 2382 virtual SourceRange getSourceRange() const { 2383 return SourceRange(BuiltinLoc, RParenLoc); 2384 } 2385 static bool classof(const Stmt *T) { 2386 return T->getStmtClass() == ChooseExprClass; 2387 } 2388 static bool classof(const ChooseExpr *) { return true; } 2389 2390 // Iterators 2391 virtual child_iterator child_begin(); 2392 virtual child_iterator child_end(); 2393}; 2394 2395/// GNUNullExpr - Implements the GNU __null extension, which is a name 2396/// for a null pointer constant that has integral type (e.g., int or 2397/// long) and is the same size and alignment as a pointer. The __null 2398/// extension is typically only used by system headers, which define 2399/// NULL as __null in C++ rather than using 0 (which is an integer 2400/// that may not match the size of a pointer). 2401class GNUNullExpr : public Expr { 2402 /// TokenLoc - The location of the __null keyword. 2403 SourceLocation TokenLoc; 2404 2405public: 2406 GNUNullExpr(QualType Ty, SourceLocation Loc) 2407 : Expr(GNUNullExprClass, Ty, false, false), TokenLoc(Loc) { } 2408 2409 /// \brief Build an empty GNU __null expression. 2410 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2411 2412 /// getTokenLocation - The location of the __null token. 2413 SourceLocation getTokenLocation() const { return TokenLoc; } 2414 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2415 2416 virtual SourceRange getSourceRange() const { 2417 return SourceRange(TokenLoc); 2418 } 2419 static bool classof(const Stmt *T) { 2420 return T->getStmtClass() == GNUNullExprClass; 2421 } 2422 static bool classof(const GNUNullExpr *) { return true; } 2423 2424 // Iterators 2425 virtual child_iterator child_begin(); 2426 virtual child_iterator child_end(); 2427}; 2428 2429/// VAArgExpr, used for the builtin function __builtin_va_arg. 2430class VAArgExpr : public Expr { 2431 Stmt *Val; 2432 SourceLocation BuiltinLoc, RParenLoc; 2433public: 2434 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2435 : Expr(VAArgExprClass, t, t->isDependentType(), false), 2436 Val(e), 2437 BuiltinLoc(BLoc), 2438 RParenLoc(RPLoc) { } 2439 2440 /// \brief Create an empty __builtin_va_arg expression. 2441 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2442 2443 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2444 Expr *getSubExpr() { return cast<Expr>(Val); } 2445 void setSubExpr(Expr *E) { Val = E; } 2446 2447 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2448 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2449 2450 SourceLocation getRParenLoc() const { return RParenLoc; } 2451 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2452 2453 virtual SourceRange getSourceRange() const { 2454 return SourceRange(BuiltinLoc, RParenLoc); 2455 } 2456 static bool classof(const Stmt *T) { 2457 return T->getStmtClass() == VAArgExprClass; 2458 } 2459 static bool classof(const VAArgExpr *) { return true; } 2460 2461 // Iterators 2462 virtual child_iterator child_begin(); 2463 virtual child_iterator child_end(); 2464}; 2465 2466/// @brief Describes an C or C++ initializer list. 2467/// 2468/// InitListExpr describes an initializer list, which can be used to 2469/// initialize objects of different types, including 2470/// struct/class/union types, arrays, and vectors. For example: 2471/// 2472/// @code 2473/// struct foo x = { 1, { 2, 3 } }; 2474/// @endcode 2475/// 2476/// Prior to semantic analysis, an initializer list will represent the 2477/// initializer list as written by the user, but will have the 2478/// placeholder type "void". This initializer list is called the 2479/// syntactic form of the initializer, and may contain C99 designated 2480/// initializers (represented as DesignatedInitExprs), initializations 2481/// of subobject members without explicit braces, and so on. Clients 2482/// interested in the original syntax of the initializer list should 2483/// use the syntactic form of the initializer list. 2484/// 2485/// After semantic analysis, the initializer list will represent the 2486/// semantic form of the initializer, where the initializations of all 2487/// subobjects are made explicit with nested InitListExpr nodes and 2488/// C99 designators have been eliminated by placing the designated 2489/// initializations into the subobject they initialize. Additionally, 2490/// any "holes" in the initialization, where no initializer has been 2491/// specified for a particular subobject, will be replaced with 2492/// implicitly-generated ImplicitValueInitExpr expressions that 2493/// value-initialize the subobjects. Note, however, that the 2494/// initializer lists may still have fewer initializers than there are 2495/// elements to initialize within the object. 2496/// 2497/// Given the semantic form of the initializer list, one can retrieve 2498/// the original syntactic form of that initializer list (if it 2499/// exists) using getSyntacticForm(). Since many initializer lists 2500/// have the same syntactic and semantic forms, getSyntacticForm() may 2501/// return NULL, indicating that the current initializer list also 2502/// serves as its syntactic form. 2503class InitListExpr : public Expr { 2504 // FIXME: Eliminate this vector in favor of ASTContext allocation 2505 typedef ASTVector<Stmt *> InitExprsTy; 2506 InitExprsTy InitExprs; 2507 SourceLocation LBraceLoc, RBraceLoc; 2508 2509 /// Contains the initializer list that describes the syntactic form 2510 /// written in the source code. 2511 InitListExpr *SyntacticForm; 2512 2513 /// If this initializer list initializes a union, specifies which 2514 /// field within the union will be initialized. 2515 FieldDecl *UnionFieldInit; 2516 2517 /// Whether this initializer list originally had a GNU array-range 2518 /// designator in it. This is a temporary marker used by CodeGen. 2519 bool HadArrayRangeDesignator; 2520 2521public: 2522 InitListExpr(ASTContext &C, SourceLocation lbraceloc, 2523 Expr **initexprs, unsigned numinits, 2524 SourceLocation rbraceloc); 2525 2526 /// \brief Build an empty initializer list. 2527 explicit InitListExpr(ASTContext &C, EmptyShell Empty) 2528 : Expr(InitListExprClass, Empty), InitExprs(C) { } 2529 2530 unsigned getNumInits() const { return InitExprs.size(); } 2531 2532 const Expr* getInit(unsigned Init) const { 2533 assert(Init < getNumInits() && "Initializer access out of range!"); 2534 return cast_or_null<Expr>(InitExprs[Init]); 2535 } 2536 2537 Expr* getInit(unsigned Init) { 2538 assert(Init < getNumInits() && "Initializer access out of range!"); 2539 return cast_or_null<Expr>(InitExprs[Init]); 2540 } 2541 2542 void setInit(unsigned Init, Expr *expr) { 2543 assert(Init < getNumInits() && "Initializer access out of range!"); 2544 InitExprs[Init] = expr; 2545 } 2546 2547 /// \brief Reserve space for some number of initializers. 2548 void reserveInits(ASTContext &C, unsigned NumInits); 2549 2550 /// @brief Specify the number of initializers 2551 /// 2552 /// If there are more than @p NumInits initializers, the remaining 2553 /// initializers will be destroyed. If there are fewer than @p 2554 /// NumInits initializers, NULL expressions will be added for the 2555 /// unknown initializers. 2556 void resizeInits(ASTContext &Context, unsigned NumInits); 2557 2558 /// @brief Updates the initializer at index @p Init with the new 2559 /// expression @p expr, and returns the old expression at that 2560 /// location. 2561 /// 2562 /// When @p Init is out of range for this initializer list, the 2563 /// initializer list will be extended with NULL expressions to 2564 /// accomodate the new entry. 2565 Expr *updateInit(ASTContext &C, unsigned Init, Expr *expr); 2566 2567 /// \brief If this initializes a union, specifies which field in the 2568 /// union to initialize. 2569 /// 2570 /// Typically, this field is the first named field within the 2571 /// union. However, a designated initializer can specify the 2572 /// initialization of a different field within the union. 2573 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2574 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2575 2576 // Explicit InitListExpr's originate from source code (and have valid source 2577 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2578 bool isExplicit() { 2579 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2580 } 2581 2582 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2583 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2584 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2585 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2586 2587 /// @brief Retrieve the initializer list that describes the 2588 /// syntactic form of the initializer. 2589 /// 2590 /// 2591 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2592 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2593 2594 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2595 void sawArrayRangeDesignator(bool ARD = true) { 2596 HadArrayRangeDesignator = ARD; 2597 } 2598 2599 virtual SourceRange getSourceRange() const { 2600 return SourceRange(LBraceLoc, RBraceLoc); 2601 } 2602 static bool classof(const Stmt *T) { 2603 return T->getStmtClass() == InitListExprClass; 2604 } 2605 static bool classof(const InitListExpr *) { return true; } 2606 2607 // Iterators 2608 virtual child_iterator child_begin(); 2609 virtual child_iterator child_end(); 2610 2611 typedef InitExprsTy::iterator iterator; 2612 typedef InitExprsTy::reverse_iterator reverse_iterator; 2613 2614 iterator begin() { return InitExprs.begin(); } 2615 iterator end() { return InitExprs.end(); } 2616 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2617 reverse_iterator rend() { return InitExprs.rend(); } 2618}; 2619 2620/// @brief Represents a C99 designated initializer expression. 2621/// 2622/// A designated initializer expression (C99 6.7.8) contains one or 2623/// more designators (which can be field designators, array 2624/// designators, or GNU array-range designators) followed by an 2625/// expression that initializes the field or element(s) that the 2626/// designators refer to. For example, given: 2627/// 2628/// @code 2629/// struct point { 2630/// double x; 2631/// double y; 2632/// }; 2633/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2634/// @endcode 2635/// 2636/// The InitListExpr contains three DesignatedInitExprs, the first of 2637/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2638/// designators, one array designator for @c [2] followed by one field 2639/// designator for @c .y. The initalization expression will be 1.0. 2640class DesignatedInitExpr : public Expr { 2641public: 2642 /// \brief Forward declaration of the Designator class. 2643 class Designator; 2644 2645private: 2646 /// The location of the '=' or ':' prior to the actual initializer 2647 /// expression. 2648 SourceLocation EqualOrColonLoc; 2649 2650 /// Whether this designated initializer used the GNU deprecated 2651 /// syntax rather than the C99 '=' syntax. 2652 bool GNUSyntax : 1; 2653 2654 /// The number of designators in this initializer expression. 2655 unsigned NumDesignators : 15; 2656 2657 /// \brief The designators in this designated initialization 2658 /// expression. 2659 Designator *Designators; 2660 2661 /// The number of subexpressions of this initializer expression, 2662 /// which contains both the initializer and any additional 2663 /// expressions used by array and array-range designators. 2664 unsigned NumSubExprs : 16; 2665 2666 2667 DesignatedInitExpr(ASTContext &C, QualType Ty, unsigned NumDesignators, 2668 const Designator *Designators, 2669 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2670 Expr **IndexExprs, unsigned NumIndexExprs, 2671 Expr *Init); 2672 2673 explicit DesignatedInitExpr(unsigned NumSubExprs) 2674 : Expr(DesignatedInitExprClass, EmptyShell()), 2675 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2676 2677protected: 2678 virtual void DoDestroy(ASTContext &C); 2679 2680 void DestroyDesignators(ASTContext &C); 2681 2682public: 2683 /// A field designator, e.g., ".x". 2684 struct FieldDesignator { 2685 /// Refers to the field that is being initialized. The low bit 2686 /// of this field determines whether this is actually a pointer 2687 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2688 /// initially constructed, a field designator will store an 2689 /// IdentifierInfo*. After semantic analysis has resolved that 2690 /// name, the field designator will instead store a FieldDecl*. 2691 uintptr_t NameOrField; 2692 2693 /// The location of the '.' in the designated initializer. 2694 unsigned DotLoc; 2695 2696 /// The location of the field name in the designated initializer. 2697 unsigned FieldLoc; 2698 }; 2699 2700 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2701 struct ArrayOrRangeDesignator { 2702 /// Location of the first index expression within the designated 2703 /// initializer expression's list of subexpressions. 2704 unsigned Index; 2705 /// The location of the '[' starting the array range designator. 2706 unsigned LBracketLoc; 2707 /// The location of the ellipsis separating the start and end 2708 /// indices. Only valid for GNU array-range designators. 2709 unsigned EllipsisLoc; 2710 /// The location of the ']' terminating the array range designator. 2711 unsigned RBracketLoc; 2712 }; 2713 2714 /// @brief Represents a single C99 designator. 2715 /// 2716 /// @todo This class is infuriatingly similar to clang::Designator, 2717 /// but minor differences (storing indices vs. storing pointers) 2718 /// keep us from reusing it. Try harder, later, to rectify these 2719 /// differences. 2720 class Designator { 2721 /// @brief The kind of designator this describes. 2722 enum { 2723 FieldDesignator, 2724 ArrayDesignator, 2725 ArrayRangeDesignator 2726 } Kind; 2727 2728 union { 2729 /// A field designator, e.g., ".x". 2730 struct FieldDesignator Field; 2731 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2732 struct ArrayOrRangeDesignator ArrayOrRange; 2733 }; 2734 friend class DesignatedInitExpr; 2735 2736 public: 2737 Designator() {} 2738 2739 /// @brief Initializes a field designator. 2740 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2741 SourceLocation FieldLoc) 2742 : Kind(FieldDesignator) { 2743 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2744 Field.DotLoc = DotLoc.getRawEncoding(); 2745 Field.FieldLoc = FieldLoc.getRawEncoding(); 2746 } 2747 2748 /// @brief Initializes an array designator. 2749 Designator(unsigned Index, SourceLocation LBracketLoc, 2750 SourceLocation RBracketLoc) 2751 : Kind(ArrayDesignator) { 2752 ArrayOrRange.Index = Index; 2753 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2754 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2755 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2756 } 2757 2758 /// @brief Initializes a GNU array-range designator. 2759 Designator(unsigned Index, SourceLocation LBracketLoc, 2760 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2761 : Kind(ArrayRangeDesignator) { 2762 ArrayOrRange.Index = Index; 2763 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2764 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2765 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2766 } 2767 2768 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2769 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2770 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2771 2772 IdentifierInfo * getFieldName(); 2773 2774 FieldDecl *getField() { 2775 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2776 if (Field.NameOrField & 0x01) 2777 return 0; 2778 else 2779 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2780 } 2781 2782 void setField(FieldDecl *FD) { 2783 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2784 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2785 } 2786 2787 SourceLocation getDotLoc() const { 2788 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2789 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2790 } 2791 2792 SourceLocation getFieldLoc() const { 2793 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2794 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2795 } 2796 2797 SourceLocation getLBracketLoc() const { 2798 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2799 "Only valid on an array or array-range designator"); 2800 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2801 } 2802 2803 SourceLocation getRBracketLoc() const { 2804 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2805 "Only valid on an array or array-range designator"); 2806 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2807 } 2808 2809 SourceLocation getEllipsisLoc() const { 2810 assert(Kind == ArrayRangeDesignator && 2811 "Only valid on an array-range designator"); 2812 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2813 } 2814 2815 unsigned getFirstExprIndex() const { 2816 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2817 "Only valid on an array or array-range designator"); 2818 return ArrayOrRange.Index; 2819 } 2820 2821 SourceLocation getStartLocation() const { 2822 if (Kind == FieldDesignator) 2823 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2824 else 2825 return getLBracketLoc(); 2826 } 2827 }; 2828 2829 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2830 unsigned NumDesignators, 2831 Expr **IndexExprs, unsigned NumIndexExprs, 2832 SourceLocation EqualOrColonLoc, 2833 bool GNUSyntax, Expr *Init); 2834 2835 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2836 2837 /// @brief Returns the number of designators in this initializer. 2838 unsigned size() const { return NumDesignators; } 2839 2840 // Iterator access to the designators. 2841 typedef Designator* designators_iterator; 2842 designators_iterator designators_begin() { return Designators; } 2843 designators_iterator designators_end() { 2844 return Designators + NumDesignators; 2845 } 2846 2847 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2848 2849 void setDesignators(ASTContext &C, const Designator *Desigs, 2850 unsigned NumDesigs); 2851 2852 Expr *getArrayIndex(const Designator& D); 2853 Expr *getArrayRangeStart(const Designator& D); 2854 Expr *getArrayRangeEnd(const Designator& D); 2855 2856 /// @brief Retrieve the location of the '=' that precedes the 2857 /// initializer value itself, if present. 2858 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2859 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2860 2861 /// @brief Determines whether this designated initializer used the 2862 /// deprecated GNU syntax for designated initializers. 2863 bool usesGNUSyntax() const { return GNUSyntax; } 2864 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2865 2866 /// @brief Retrieve the initializer value. 2867 Expr *getInit() const { 2868 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2869 } 2870 2871 void setInit(Expr *init) { 2872 *child_begin() = init; 2873 } 2874 2875 /// \brief Retrieve the total number of subexpressions in this 2876 /// designated initializer expression, including the actual 2877 /// initialized value and any expressions that occur within array 2878 /// and array-range designators. 2879 unsigned getNumSubExprs() const { return NumSubExprs; } 2880 2881 Expr *getSubExpr(unsigned Idx) { 2882 assert(Idx < NumSubExprs && "Subscript out of range"); 2883 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2884 Ptr += sizeof(DesignatedInitExpr); 2885 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2886 } 2887 2888 void setSubExpr(unsigned Idx, Expr *E) { 2889 assert(Idx < NumSubExprs && "Subscript out of range"); 2890 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2891 Ptr += sizeof(DesignatedInitExpr); 2892 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2893 } 2894 2895 /// \brief Replaces the designator at index @p Idx with the series 2896 /// of designators in [First, Last). 2897 void ExpandDesignator(ASTContext &C, unsigned Idx, const Designator *First, 2898 const Designator *Last); 2899 2900 virtual SourceRange getSourceRange() const; 2901 2902 static bool classof(const Stmt *T) { 2903 return T->getStmtClass() == DesignatedInitExprClass; 2904 } 2905 static bool classof(const DesignatedInitExpr *) { return true; } 2906 2907 // Iterators 2908 virtual child_iterator child_begin(); 2909 virtual child_iterator child_end(); 2910}; 2911 2912/// \brief Represents an implicitly-generated value initialization of 2913/// an object of a given type. 2914/// 2915/// Implicit value initializations occur within semantic initializer 2916/// list expressions (InitListExpr) as placeholders for subobject 2917/// initializations not explicitly specified by the user. 2918/// 2919/// \see InitListExpr 2920class ImplicitValueInitExpr : public Expr { 2921public: 2922 explicit ImplicitValueInitExpr(QualType ty) 2923 : Expr(ImplicitValueInitExprClass, ty, false, false) { } 2924 2925 /// \brief Construct an empty implicit value initialization. 2926 explicit ImplicitValueInitExpr(EmptyShell Empty) 2927 : Expr(ImplicitValueInitExprClass, Empty) { } 2928 2929 static bool classof(const Stmt *T) { 2930 return T->getStmtClass() == ImplicitValueInitExprClass; 2931 } 2932 static bool classof(const ImplicitValueInitExpr *) { return true; } 2933 2934 virtual SourceRange getSourceRange() const { 2935 return SourceRange(); 2936 } 2937 2938 // Iterators 2939 virtual child_iterator child_begin(); 2940 virtual child_iterator child_end(); 2941}; 2942 2943 2944class ParenListExpr : public Expr { 2945 Stmt **Exprs; 2946 unsigned NumExprs; 2947 SourceLocation LParenLoc, RParenLoc; 2948 2949protected: 2950 virtual void DoDestroy(ASTContext& C); 2951 2952public: 2953 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2954 unsigned numexprs, SourceLocation rparenloc); 2955 2956 ~ParenListExpr() {} 2957 2958 /// \brief Build an empty paren list. 2959 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2960 2961 unsigned getNumExprs() const { return NumExprs; } 2962 2963 const Expr* getExpr(unsigned Init) const { 2964 assert(Init < getNumExprs() && "Initializer access out of range!"); 2965 return cast_or_null<Expr>(Exprs[Init]); 2966 } 2967 2968 Expr* getExpr(unsigned Init) { 2969 assert(Init < getNumExprs() && "Initializer access out of range!"); 2970 return cast_or_null<Expr>(Exprs[Init]); 2971 } 2972 2973 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2974 2975 SourceLocation getLParenLoc() const { return LParenLoc; } 2976 SourceLocation getRParenLoc() const { return RParenLoc; } 2977 2978 virtual SourceRange getSourceRange() const { 2979 return SourceRange(LParenLoc, RParenLoc); 2980 } 2981 static bool classof(const Stmt *T) { 2982 return T->getStmtClass() == ParenListExprClass; 2983 } 2984 static bool classof(const ParenListExpr *) { return true; } 2985 2986 // Iterators 2987 virtual child_iterator child_begin(); 2988 virtual child_iterator child_end(); 2989}; 2990 2991 2992//===----------------------------------------------------------------------===// 2993// Clang Extensions 2994//===----------------------------------------------------------------------===// 2995 2996 2997/// ExtVectorElementExpr - This represents access to specific elements of a 2998/// vector, and may occur on the left hand side or right hand side. For example 2999/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 3000/// 3001/// Note that the base may have either vector or pointer to vector type, just 3002/// like a struct field reference. 3003/// 3004class ExtVectorElementExpr : public Expr { 3005 Stmt *Base; 3006 IdentifierInfo *Accessor; 3007 SourceLocation AccessorLoc; 3008public: 3009 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 3010 SourceLocation loc) 3011 : Expr(ExtVectorElementExprClass, ty, base->isTypeDependent(), 3012 base->isValueDependent()), 3013 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 3014 3015 /// \brief Build an empty vector element expression. 3016 explicit ExtVectorElementExpr(EmptyShell Empty) 3017 : Expr(ExtVectorElementExprClass, Empty) { } 3018 3019 const Expr *getBase() const { return cast<Expr>(Base); } 3020 Expr *getBase() { return cast<Expr>(Base); } 3021 void setBase(Expr *E) { Base = E; } 3022 3023 IdentifierInfo &getAccessor() const { return *Accessor; } 3024 void setAccessor(IdentifierInfo *II) { Accessor = II; } 3025 3026 SourceLocation getAccessorLoc() const { return AccessorLoc; } 3027 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 3028 3029 /// getNumElements - Get the number of components being selected. 3030 unsigned getNumElements() const; 3031 3032 /// containsDuplicateElements - Return true if any element access is 3033 /// repeated. 3034 bool containsDuplicateElements() const; 3035 3036 /// getEncodedElementAccess - Encode the elements accessed into an llvm 3037 /// aggregate Constant of ConstantInt(s). 3038 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 3039 3040 virtual SourceRange getSourceRange() const { 3041 return SourceRange(getBase()->getLocStart(), AccessorLoc); 3042 } 3043 3044 /// isArrow - Return true if the base expression is a pointer to vector, 3045 /// return false if the base expression is a vector. 3046 bool isArrow() const; 3047 3048 static bool classof(const Stmt *T) { 3049 return T->getStmtClass() == ExtVectorElementExprClass; 3050 } 3051 static bool classof(const ExtVectorElementExpr *) { return true; } 3052 3053 // Iterators 3054 virtual child_iterator child_begin(); 3055 virtual child_iterator child_end(); 3056}; 3057 3058 3059/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 3060/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 3061class BlockExpr : public Expr { 3062protected: 3063 BlockDecl *TheBlock; 3064 bool HasBlockDeclRefExprs; 3065public: 3066 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 3067 : Expr(BlockExprClass, ty, ty->isDependentType(), false), 3068 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 3069 3070 /// \brief Build an empty block expression. 3071 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 3072 3073 const BlockDecl *getBlockDecl() const { return TheBlock; } 3074 BlockDecl *getBlockDecl() { return TheBlock; } 3075 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 3076 3077 // Convenience functions for probing the underlying BlockDecl. 3078 SourceLocation getCaretLocation() const; 3079 const Stmt *getBody() const; 3080 Stmt *getBody(); 3081 3082 virtual SourceRange getSourceRange() const { 3083 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 3084 } 3085 3086 /// getFunctionType - Return the underlying function type for this block. 3087 const FunctionType *getFunctionType() const; 3088 3089 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 3090 /// inside of the block that reference values outside the block. 3091 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 3092 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 3093 3094 static bool classof(const Stmt *T) { 3095 return T->getStmtClass() == BlockExprClass; 3096 } 3097 static bool classof(const BlockExpr *) { return true; } 3098 3099 // Iterators 3100 virtual child_iterator child_begin(); 3101 virtual child_iterator child_end(); 3102}; 3103 3104/// BlockDeclRefExpr - A reference to a declared variable, function, 3105/// enum, etc. 3106class BlockDeclRefExpr : public Expr { 3107 ValueDecl *D; 3108 SourceLocation Loc; 3109 bool IsByRef : 1; 3110 bool ConstQualAdded : 1; 3111public: 3112 // FIXME: Fix type/value dependence! 3113 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 3114 bool constAdded = false) 3115 : Expr(BlockDeclRefExprClass, t, false, false), D(d), Loc(l), IsByRef(ByRef), 3116 ConstQualAdded(constAdded) {} 3117 3118 // \brief Build an empty reference to a declared variable in a 3119 // block. 3120 explicit BlockDeclRefExpr(EmptyShell Empty) 3121 : Expr(BlockDeclRefExprClass, Empty) { } 3122 3123 ValueDecl *getDecl() { return D; } 3124 const ValueDecl *getDecl() const { return D; } 3125 void setDecl(ValueDecl *VD) { D = VD; } 3126 3127 SourceLocation getLocation() const { return Loc; } 3128 void setLocation(SourceLocation L) { Loc = L; } 3129 3130 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 3131 3132 bool isByRef() const { return IsByRef; } 3133 void setByRef(bool BR) { IsByRef = BR; } 3134 3135 bool isConstQualAdded() const { return ConstQualAdded; } 3136 void setConstQualAdded(bool C) { ConstQualAdded = C; } 3137 3138 static bool classof(const Stmt *T) { 3139 return T->getStmtClass() == BlockDeclRefExprClass; 3140 } 3141 static bool classof(const BlockDeclRefExpr *) { return true; } 3142 3143 // Iterators 3144 virtual child_iterator child_begin(); 3145 virtual child_iterator child_end(); 3146}; 3147 3148} // end namespace clang 3149 3150#endif 3151